Today we have Dr. Karl Herrup, a neurobiologist known for his investigations into the roles that DNA damage and noncoding genetic variants have in Alzheimer’s disease.

Joining Ken today to interview Karl is Dr. Tommy Wood, a visiting scientist here at IHMC.  Tommy also is an associate professor of pediatrics and neuroscience at the University of Washington, where he focuses on brain health across lifespan. He has been our guest several times on STEM-Talk and we will have links to those interviews in our show notes for today’s episode.

After more than a century of research, the underlying cause of Alzheimer’s remains a mystery. For the past few decades, the leading theory has been the amyloid cascade hypothesis, which proposes that abnormal amyloid plaques in the brain are the central cause of the disease.

Today we talk to Karl about his lab and research as well as his view that the amyloid cascade hypothesis is not only flawed,  but also could be holding back research for a cure of Alzheimer’s.

A professor of neurobiology and an investigator in the Alzheimer’s Disease Research Center at the University of Pittsburgh School of Medicine, Herrup is the author of How Not to Study a Disease: The Story of Alzheimer’s.

Show notes:

[00:03:50] Tommy asks Karl what he was like as a kid to open the interview.

[00:04:36] Tommy asks Karl about his educational environment growing up.

[00:05:10] Ken mentions that Karl went to Brandies University originally with the intent of becoming a physician and asks Karl what happened to change his mind.

[00:06:14] Ken asks Karl if it is true that his father was disappointed with Karl’s decision to abandon medical school in favor of genetics.

[00:07:02] Tommy mentions that Karl began researching genetics in the late 1960s when researchers were just beginning to unravel the secrets of DNA. Tommy asks Karl to discuss why this was such an exciting time to study genetics.

[00:08:38] Tommy asks Karl what prompted him to pursue a PhD in neuroscience.

[00:11:34] Continuing on the theme of happy accidents, Ken asks if it was also an accident that led to Karl moving to Switzerland for a second post-doc.

[00:12:36] Ken asks Karl to expound on his experience taking an overseas post-doc, which was not a common practice in the 1970s.

[00:14:11] Ken mentions that Karl has seemed to benefit in his life from the combination of preparation and the willingness to explore opportunities that present themselves.

[00:15:00] Tommy mentions that when Karl arrived back in the US from Switzerland, he accepted a faculty position at Yale and asks him to discuss this experience.

[00:17:06] Tommy mentions that after Yale, Karl had several faculty appointments, including a seven-year stint in Hong Kong, and asks Karl to talk about that experience.

[00:21:36] Tommy asks Karl why, in 2019, he moved back to his hometown to become a professor of neurobiology at the University of Pittsburgh and co-investigator at the university’s Alzheimer’s research center.

[00:24:45] Ken asks Karl to talk about his lab at the University of Pittsburgh, which focuses on the biology of neurodegeneration.

[00:26:32] Ken asks Karl if there was anything specific that caused him to shift his focus at this stage in his career so heavily towards Alzheimer’s research.

[00:28:21] Tommy comments on Karl’s hypothesis of the aging brain, noting that it would make sense for the same processes involved in the developing brain to relate to what we see in the aging brain, as these processes are continuous throughout the lifespan.

[00:29:54] Tommy pivots to talk about Karl’s book, entitled “How Not to Study a Disease: The Story of Alzheimer’s” for which Karl interviewed a number of experts and colleagues, asking each one to define Alzheimer’s disease in their own words.

[00:30:51] Tommy reiterates the point that we still do not have a universally accepted definition of Alzheimer’s disease and asks Karl why this is such a critical problem for the field.

[00:32:27] Ken asks if Karl has a working definition of Alzheimer’s disease.

[00:33:47] Ken explains that Karl begins his book with the story of a woman named Dorothy, who after living a vibrant life and taking good care of herself as she aged, fell victim to Alzheimer’s disease. Ken asks Karl to talk about Dorothy, and why he chose to begin his book with her story.

[00:36:58] Tommy asks Karl to define the difference between Alzheimer’s and dementia more broadly.

[00:38:00] Tommy explains that while Alzheimer’s is typically characterized as a disease of late life, early onset Alzheimer’s, while rare, is possible, typically very aggressive, and generally runs in families. Tommy asks Karl to explain how we differentiate late and early onset Alzheimer’s.

[00:38:58] Ken asks Karl to explain how one differentiates Alzheimer’s from other forms of dementia in a clinical context.

[00:41:53] Ken points out that the title of Karl’s book “How Not to Study a Disease” highlights that assumptions about Alzheimer’s disease potentially have misdirected research in some ways. Ken asks Karl to talk about this misdirection and its consequences.

[00:43:37] Tommy gives some background on the amyloid cascade hypothesis, explaining that Dr. Alzheimer himself was not entirely convinced that the cases he had been studying were necessarily representative of a single condition.  Dr. Alzheimer’s mentor, Dr. Kraepelin, coined the disease in a book that he was writing. Tommy also mentions that Karl has said that this is one of three key events that cemented the amyloid cascade hypothesis as the leading hypothesis of Alzheimer’s disease and asks Karl to discuss more of this history.

[00:49:20] Tommy asks Karl to give an overview of the amyloid cascade hypothesis.

[00:53:36] Ken explains that Karl sees the amyloid cascade hypothesis as failing three basic tests. Ken goes on to ask Karl to discuss, in depth, the first test, which is the fact that in both humans and mice the addition of amyloid to healthy brains does not trigger an amyloid cascade.

[00:56:55] Tommy moves to Karl’s second test of the amyloid cascade hypothesis, the fact that removal of amyloid from the brains of mice and humans does not stop Alzheimer’s disease processes. Given the recent FDA approval of several anti-amyloid drugs, Tommy asks Karl to give his thoughts on the history of anti-amyloid therapies.

[01:03:29] Ken explains that the third test of the amyloid cascade hypothesis entails blocking the formation of amyloid from the amyloid precursor protein, which was not only found to not stop Alzheimer’s progression, but in fact makes humans and mice sicker.

[01:05:47] Ken takes a moment to clarify that Karl is not arguing that amyloid has no role in Alzheimer’s disease, just that it is not the primary cause of Alzheimer’s.

[01:06:21] Ken asks Karl what his response is when people ask what he proposes the cause of Alzheimer’s is if it’s not amyloid.

[01:08:45] Tommy asks Karl to elaborate on the idea of the emergent nature of the brain and the potential for this emergence to help explain Alzheimer’s disease.

[01:10:54] Ken mentions that the last section of Karl’s book is titled “Where Do We Go From Here” in which he argues that because age is an absolute prerequisite for Alzheimer’s, there is no solution to the problem of dementia that does not rely heavily on an understanding of the process of aging. Ken goes on to explain that much of this was originally posited in Karl’s 2010 paper Reimagining Alzheimer’s disease: An age-based hypothesis. Ken goes on to ask Karl to talk about his view that developing an age-based hypothesis is going to be difficult given that aging is one of the greatest unsolved mysteries in biology.

[01:13:19] Ken mentions that aging research gets a very small amount of funding in comparison to the myriad disorders for which aging is the primary risk factor.

[01:16:11] Tommy shifts gears to talk about a series of studies that Karl conducted on the benefits of exposure to Japanese gardens on the clinical symptoms of Alzheimer’s disease. In one of these studies, Karl found that the Japanese garden not only relieved physiological stress but also improved qualitative measures such as verbalization and memory retrieval. Tommy asks Karl how he became interested in Japanese gardens, and if the results of his experiments surprised him.

[01:20:33] Tommy comments that Karl’s work on the effects of Japanese gardens on the clinical symptoms of Alzheimer’s contributes to a larger body of literature showing the critical importance of the environment in shaping and maintaining cognitive function. Tommy goes on to say that the decline in certain cases of Alzheimer’s can be matched to the increasing levels of institutionalization and the decrease of enriching stimuli in a patient’s environment as their disease progresses. Tommy asks Karl to talk about the importance of social, cognitive, and environmental stimuli for cognitive function.

[01:23:34] Ken mentions that Karl has pointed out in the past that non-pharmacological approaches to treating Alzheimer’s have been the most effective tools in our arsenal so far. Given this, Ken asks Karl what he recommends to people for their brain health and cognitive function.

[01:25:22] Ken explains that Karl is involved with, or supports, at least two charitable organizations that aim to reshape the face of funding for Alzheimer’s research, namely the Coins for Alzheimer’s Research Trust, and the Clear Thoughts Foundation. Ken asks Karl to talk about his relationship to these organizations and what he hopes will change in the landscape of Alzheimer’s research funding.

[01:27:23] Tommy closes our interview asking whether Karl has a Japanese garden of his own in his back yard.

Links:

About IHMC

Karl Herrup bio

Ken Ford bio

Ken Ford Wikipedia page

Tommy Wood bio

Tommy Wood STEM-Talk episode 47

Tommy Wood STEM-Talk episode 48

Tommy Wood STEM-Talk episode 110

Tommy Wood STEM-Talk episode 111

Tommy Wood STEM-Talk episode 128

Today we have Dr. Frank Butler, a retired Navy Undersea Medical Officer and an ophthalmologist who served as a Navy SEAL platoon commander prior to attending medical school.

Just a few weeks after our interview, President Joe Biden awarded Frank a Presidential Citizens Medal during a White House ceremony. The medal is one of the highest honors a civilian can receive and recognized Frank’s many contributions to civilian and military trauma care.

Frank is credited with founding Tactical Combat Causality Care, also known as TC Three, which has transformed battlefield medical care and saved thousands of lives.  TCCC is now used throughout the U.S. military and much of the world. In today’s interview, we talk to Frank about his recent book, “Tell Them Yourself: It’s Not Your Day to Die,” which describes the challenges and improvements TCCC has experienced over the past three decades.

Frank spent most of his 26-year career in Navy Medicine supporting the Special Operations community. He served a five-year stint as a Diving Medical Research officer at the Navy Experimental Diving Unit in Panama City, Fla., where he helped develop many of the diving techniques and procedures used by Navy SEALs today.

Show notes:

[00:03:31] Dawn opens the interview asking Frank what it was like growing up in Savannah, Ga., in the 50s and 60s.

[00:04:40] Dawn asks Frank about his father, who was an industrial engineer, and who became director of urban housing in Savannah during a time when the city was developing public housing.

[00:05:47] Ken asks Frank if it’s true that most of his family went into the medical field.

[00:06:33] Ken asks Frank about his experience attending a Navy SEALs demonstration during his sophomore year of college.

[00:08:09] Dawn asks Frank about his experience going through Navy SEAL training, particularly the Basic Underwater Demolition SEALs School.

[00:09:29] Dawn asks if it’s true that five people in Frank’s family have become Navy SEALs.

[00:10:08] Ken explains that after Frank left the SEALs in 1975, he had to figure out what to do next with his life. Frank talks about what led to his decision to go to medical school.

[00:11:14] Ken asks Frank how he ended up at Jacksonville Naval Hospital to do an internship in family medicine.

[00:11:46] Dawn explains that after Frank’s internship, he was assigned to the Navy Experimental Dive Unit. She asks him to talk about this experience.

[00:12:25] Frank talks about some of the projects he worked on during this period.

[00:14:43] Ken asks Frank how he decided on ophthalmology as his surgical specialization.

[00:15:47] Dawn asks Frank what his experience as a resident at Bethesda Naval Hospital was like.

[00:16:52] Dawn explains that after Frank completed his residency, he was assigned to Pensacola Naval Hospital. Dawn asks Frank how he ended up becoming the biomedical research director for the Navy SEALs.

[00:18:48] Ken mentions that Frank worked on several important projects as research director for the SEALs, including battlefield trauma care, a tactical athlete program, improved treatment of decompression sickness, and the Navy SEAL nutrition guide. Ken begins by asking Frank to talk about his work on the tactical athlete program.

[00:20:33] Dawn explains that another one of Frank’s projects as research director for the SEALs was the design of the Navy special warfare decompression computer. Dawn asks Frank to explain what a decompression computer does for a diver.

[00:21:35] Dawn asks Frank to elaborate on the process of designing this decompression computer and the algorithm as well as the process of getting it approved for the Navy.

[00:23:31] Ken asks Frank to talk about a program he worked on to promote refractive surgery. While this program was initially designed to improve combat vision for SEALs, the program has expanded to all active-duty service members, including aviators.

[00:26:26] Dawn explains that Tactical Combat Casualty Care (TCCC) has been an incredible transformation in battlefield trauma care, with literature indicating that the protocols have saved thousands of lives. TCCC is now used throughout the US military and much of the rest of the world. Dawn goes on to ask about Frank’s book “Tell Them Yourself: It’s Not Your Day to Die,” which documents how TCCC has evolved over the three decades since it was first introduced, as well as the trials and tribulations the program endured.

[00:28:04] Ken asks Frank to elaborate on the assertion in his book that, save for the use of helicopters in place of horse drawn carriages, pre-hospital battle trauma care was essentially the same as it was during the Civil War prior to TCCC.

[00:30:05] Following up on the discussion of tourniquets, Ken mentions his memory of the outright ban of tourniquets in the Navy during his time in the service.

[00:31:07] Ken asks Frank how he was able to take his realization that something needed to be done about battlefield trauma care and turn that into a Navy project.

[00:32:58] Dawn asks Frank how, as program manager, he approached the conduct of the TCCC research project.

[00:35:03] Dawn asks Frank why, even though the TCCC paper came out in 1996, TCCC was still not widely used in the U.S. military at the beginning of the war in Afghanistan.

[00:36:14] Frank recalls the first unit to implement TCCC.

[00:37:10] Dawn asks what other units followed as early adopters.

[00:39:26] Dawn asks Frank how he helped implement TCCC throughout the special operations community.

[00:43:11] Ken mentions that some units did particularly well in adopting TCCC and others struggled. Given this, Ken asks if the operational leader’s priority regarding TCCC impacts the implementation of it in the unit.

[00:44:31] Ken asks Frank to speak on the adoption and implementation of TCCC in the rest of the military outside of the special operations communities.

[00:47:32] Dawn asks Frank how he updated his recommendations for TCCC as new evidence from the war came in.

[00:50:31] Ken asks Frank, other than tourniquets, what medical advancements to battlefield trauma care did TCCC usher in.

[00:54:31] Ken mentions that while the TCCC innovation of carrying whole blood and performing pre-hospital blood transfusions has saved countless lives, the innovation still is not ubiquitous in the military or for civilian first responders. Ken asks Frank to talk about the complexities of a ubiquitous adoption of this practice, and what can be done to push it forward.

[01:00:06] Dawn asks, in addition to tourniquets and whole blood, what are some of the TCCC innovations that are now being widely used in the civilian world.

[01:03:19] Ken pivots to a discussion about ketamine. Ken notes that the U.S. military, as well as the militaries in other countries, have used ketamine as an anesthetic, especially since the war in Afghanistan.  Ken notes that the civilian world has been slow to adopt ketamine as a drug for pain relief. Frank gives his thoughts broadly on the use of ketamine as an anesthetic and his belief that it will become more common in civilian EMS units over the next five to 10 years.

[01:07:34] For listeners who are interested in learning more about the medical uses of ketamine, Ken recommends Episode 165 with Dr. Jonathan Edwards.

[01:09:03] Ken and Frank have a tangential discussion about ketamine as a treatment for suicidal ideation and depression.

[01:11:11] Ken asks Frank, given that the TCCC protocols have been widely adopted in every area of the military, what is the basic level of competence in TCCC that every service member should have.

[01:14:26] Ken asks Frank to speak to the situation in Ukraine with respect to combat casualty care.

[01:17:23] Looping back to Frank’s book “Tell Them Yourself: It’s Not Your Day to Die,” Dawn asks why Frank took up the task of writing it.

[01:21:20] Dawn asks Frank about the significance of the book’s title.

[01:22:04] Dawn mentions that many people speak about how compelling the first chapter of Frank’s book is. Dawn asks Frank to talk about the writing process for this chapter.

[01:25:05] Dawn mentions that one of Frank’s co-authors for his book is Dr. Kevin O’Connor, who is currently the physician to the president. Given that Frank was in the Navy and Dr. O’Connor was in the Army, Dawn asks Frank how the two of them met.

[01:26:42] As we near the end of our interview, Ken asks Frank if he has any final insights to share about battlefield trauma care.

[01:28:11] Ken comments on the importance of Frank’s book as a marker, so we don’t forget hard won lessons during times of peace.

[01:29:47] Dawn closes our interview with Frank by mentioning that he is an avid diver and asks him what his favorite spot to dive is.

Links:

Frank Butler Presidential Citizens Medal

Frank Butler IHMC lecture and bio

Learn more about IHMC

STEM-Talk homepage

Ken Ford bio

Ken Ford Wikipedia page

Dawn Kernagis bio

Today our guest is Dr. JoAnn Manson, an endocrinologist, epidemiologist, and Principal Investigator of several research studies, including the landmark Women’s Health Initiative. She is a highly cited researcher and was one of the physicians featured in the National Library of Medicine’s exhibition, History of American Women Physicians. Her primary research interests include clinical prevention trials of nutritional and lifestyle factors related to heart disease, diabetes, and cancer and the role of endogenous and exogenous estrogens as determinants of chronic disease.

Show notes:

[00:02:53] Dawn kicks off the interview by asking JoAnn what it was that drew her to endocrinology.

[00:04:33] Ken asks how the things JoAnn witnessed in her early medical practice influenced her interest in disease prevention.

[00:05:51] Dawn asks JoAnn to discuss how her mother, who suffered from ovarian cancer, influenced JoAnn’s focus on women’s health.

[00:06:40] Dawn asks JoAnn what prompted her interest in clinical research.

[00:08:06] Noting the difference between public health and laboratory medical research, Dawn asks JoAnn what the most valuable thing is that she learned from her master’s and Ph.D. work in public health at Harvard.

[00:09:10] Ken mentions that while JoAnn and many others are interested in the prevention of disease, our healthcare system does not seem focused on prevention. Ken goes on to asks if this was part of what led JoAnn to work on the Nurses’ Health Study.

[00:10:17] Ken asks JoAnn to give an overview of the Nurses’ Health Study for listeners who may not be familiar.

[00:11:41] Dawn explains that the Nurses’ Health Study found that women taking hormone therapy had a lower risk of heart disease and a reduction in all-cause mortality. Dawn asks JoAnn to talk about this finding.

[00:15:00] Ken asks JoAnn what the impact of the Nurses’ Study has been on public health and women’s health in general.

[00:16:29] Dawn asks JoAnn about her experience being a principal investigator in the Women’s Health Initiative starting in 1993.

[00:18:17] Ken asks JoAnn to give context regarding how the Women’s Health Initiative (WHI) was designed, how the women were recruited, and what the specific questions were that the study aimed to answer.

[00:21:34] Dawn mentions that the three interventions that were evaluated in the WHI were hormone therapy; calcium and vitamin D supplementation; and a low-fat diet. Dawn starts by asking JoAnn about the hormone therapy interventions, and how it was decided which hormone therapies to test.

[00:24:25] Dawn asks JoAnn to give some context to the finding from the WHI that women taking the combination of conjugated estrogen and medroxyprogesterone acetate had higher risks of breast cancer and stroke.

[00:27:01] Ken asks if the worse outcomes from hormone therapy for older women was due to their advanced age, or the hormone therapy itself.

[00:30:25] Ken asks JoAnn to talk about the risk factors for breast cancer that were uncovered by the WHI.

[00:35:38] Dawn explains that because of the WHI’s findings, it is more common to use transdermal estradiol, as opposed to the oral form evaluated in the original trial. Dawn asks JoAnn to explain how the different ways these hormone formulations are processed in the body affects the risk benefit ratio.

[00:39:04] Dawn asks if these transdermal estradiol treatments might have benefits regarding cognitive decline.

[00:43:26] Ken asks JoAnn for her thoughts on the overuse and potential misuse of the term ‘bioidentical hormones.’ Ken goes on to note that the term has seemingly become more related to marketing and further distanced from clinical science.

[00:46:48] Dawn asks JoAnn to talk about the role that perimenopausal birth control decisions can play in the management of hot flashes for women in their 40s and 50s.

[00:49:14] Ken shifts the conversation to discuss the second pillar of the WHI, calcium and vitamin D supplementation. Ken explains that this pillar of the trial tested to see if this supplementation decreased risk of hip fractures in post-menopausal women. Ken asks JoAnn to discuss these findings.

[00:53:13] Dawn asks about the third pillar of the WHI, which looked at whether a low-fat dietary pattern reduced the risk of breast cancer, colorectal cancer, or coronary heart disease.

[00:55:31] Dawn asks JoAnn what questions are left for the WHI to explore.

[01:00:17] Ken asks about a recent report in the journal Menopause, which looked at the cognitive effects of clinical menopausal symptoms.

[01:01:36] Dawn asks JoAnn to expound on what ‘cognitive decline’ is measured as, with respect to sleep loss resulting from menopausal symptoms such as hot flashes and night sweats.

[01:02:38] Dawn asks JoAnn about a study she and her colleagues conducted at Brigham showing that a comprehensive multivitamin can delay age related memory decline by an average of two years.

[01:06:41] Ken asks about the findings of JoAnn’s 2018 study in The New England Journal of Medicine, which looked at whether vitamin D supplementation resulted in a lower incidence of invasive cancers and cardiovascular events.

[01:10:11] Regarding the aforementioned study, Ken explains that a subgroup analysis raised the possibility of differential effects of cancer incidence connected to BMI. Ken asks JoAnn to elaborate on this subgroup analysis.

[01:13:41] Ken asks if the aforementioned results would look more pronounced, or different in some way, if the data was analyzed with respect to body composition as opposed to BMI.

[01:15:09] Dawn asks JoAnn what she would like to see change about how women’s health is taught and studied with respect to perimenopause, menopause, and post-menopause.

[01:16:13] Dawn asks JoAnn what she and her colleagues plan to investigate next, and what answers she thinks we will have for future generations of women as they age that we don’t have now.

[01:18:13] Ken wraps up our interview asking JoAnn what she likes to do in her spare time.

Links:

JoAnn Manson bio

Learn more about IHMC

STEM-Talk homepage

Ken Ford bio

Ken Ford Wikipedia page

Dawn Kernagis bio

Today we have Dr. Hans Van Dongen, director of the Sleep and Performance Research Center at Washington State University in Spokane. Dr. Kevin Gluck, a senior research scientist at IHMC, joins Dr. Ken Ford to interview Hans about his studies on inter-individual differences in vulnerability to fatigue as well as the cumulative cognitive deficits that follow chronic sleep restriction.

Hans is known for his mathematical modeling of fatigue’s effects on performance. At the Sleep and Performance Research Center, Hans and his colleagues investigate how sleep loss and circadian misalignment impact brain function, cognition and behavior.

Show notes:

[00:02:50] Kevin opens the interview by asking Hans about his childhood growing up in The Netherlands.

[00:03:23] Ken asks Hans what he was like as a kid.

[00:03:50] Kevin mentions Hans’s father was a math and science teacher and wonders if that influenced Hans’ interest in science.

[00:04:48] Hans talks about attending Leiden University and explains why he majored in astrophysics.

[00:06:09] Hans shares how working in a psychophysiology lab put him on a path to specialize in sleep research.

[00:08:00] Hans talks about how he was part of a study that proved the morning-evening chronotype was a biological trait, rather than a psychological one.

[00:09:55] Ken asks Hans what led him to take a post-doc position at the University of Pennsylvania.

[00:11:22] Hans explains what led him to move from the University of Pennsylvania to Washington State University.

[00:13:36] Ken mentions that The Sleep and Performance Research Center, where Hans serves as the director, is a coalition of basic and applied research laboratories that aim to understand the neurobiology of sleep and sleep loss. Ken goes on to mention that Hans and his colleagues investigate sleep and biological rhythms, and their impact on health and performance. Kevin asks Hans to give an overview of what sleep loss is and the effect it has on our metabolism, immune system, and cognitive performance.

[00:15:57] Kevin mentions Hans’ recent paper which investigated how circadian misalignment due to night shift work has been associated with an elevated risk of chronic disease. The paper demonstrated that just a few days of being on a night shift schedule throws off protein rhythms related to blood glucose regulation, energy metabolism, and inflammation. Kevin asks Hans to talk more about the findings.

[00:21:18] Ken asks how long it takes for a person’s circadian rhythm to normalize after ceasing to work night shifts.

[00:22:13] Kevin brings up Hans’ paper on the continually operating neurobiological mechanisms of homeostatic and circadian processes and their effects on neurobehavioral performance. Before asking about the paper itself, Kevin asks Hans to give an overview of the homeostatic process and its relationship to the circadian process.

[00:24:14] Ken notes that the bio-behavioral function and evolutionary advantage of the circadian process is widely recognized, but that the neurobiology of the homeostatic process and its effects on performance are still poorly understood. In a 2011 paper, Hans attempted to shed light on the underlying mechanisms of the homeostatic process to provide an explanation for why the buildup of homeostatic pressure resulting from sleep loss leads to instability in vigilant attention. To explore this, Hans first explored the time-on-task effect. Ken asks Hans to explain the time-on-task effect and its role in cognitive performance.

[00:27:06] Kevin brings up the “local sleep hypothesis,” which attempts to explain the time-on-task effect. According to the local sleep hypothesis, groups of neurons involved in performing a task will “fall asleep” as a homeostatic consequence of sustained use, which leads to an interruption in information processing, leading to impaired performance. Kevin asks Hans what empirical and scientific evidence exists for the hypothesis.

[00:32:03] Ken explains that working all hours of the day and suffering chronic sleep restriction, and at times sleep deprivation, has become normalized in our society. In light of this, Ken asks what impacts sleep deprivation and sleep restriction have on the cognitive performance and overall health.

[00:34:02] Ken asks Hans to elaborate on the fact that sleep deprivation is particularly problematic and potent with regards to decision-making when circumstances are uncertain or unexpected.

[00:38:40] Ken asks Hans what his thoughts are on stimulant use for workers and operators who need to stay awake for extended periods.

[00:41:43] Hans discusses how contrary to popular belief, even modest amounts of sleep loss can have negative impacts on cognitive and physical performance.

[00:46:40] Kevin asks Hans about the common belief that people can adapt to chronic sleep restriction.

[00:49:29] Hans describes his work with the Psychomotor Vigilance Test (PVT), which requires participants to respond as quickly as possible to a stimulus that appears at random intervals.

[00:52:46] Kevin mentions that Hans published a review paper in 2019 with Amanda Hudson and Kimberly Han in Neuropsychopharmacology. This paper points out that research on sleep deprivation, vigilant attention, and brain function may help determine the fixed connections and malleable connections between specific neuronal pathways involved in specific cognitive processes.

[00:56:22] Ken mentions that to better understand the neurocognitive effects of sleep deprivation, Hans performed a study that evaluated the strategy of ‘catching up on sleep’ a practice many people engage in during periods where sleep restriction is inevitably followed by abundant free time. Ken asks Hans to discuss the design of this study and its findings.

[01:06:41] Kevin pivots back to Hans’ study on sleep restriction and deprivation. According to the study, a person who is chronically sleep deprived experiences diminishing performance, and if that person undergoes sleep deprivation by skipping a night of sleep, their performance further diminishes. However, a person would see their performance recover within a few days of restricted sleep following sleep deprivation. Kevin asks Hans to expand on these findings.

[01:10:52] Kevin asks Hans to clarify some terminology regarding sleep health, as well as explain how someone at home can assess their own sleep health.

[01:15:13] Ken asks Hans what his sleep schedule is like.

[01:19:22] Ken mentions that Hans was recently featured in a news article about the dreaded ‘mid-day slump’ of energy. Ken goes on to explain that while it is commonly believed that the mid-day slump can be attributed to eating lunch, Hans argues that it is the result of a gap between the circadian clock and the homeostatic clock as a result of inadequate sleep. Ken asks Hans to elaborate.

[01:23:36] Ken asks if Hans thinks that the poor metabolic health of many people in North America also contributes to the mid-day slump.

[01:25:19] Ken asks Hans to think of the biggest lessons he has learned about science and life during his career.

[01:29:14] Kevin mentions that Hans and his wife enjoy traveling together, but that his wife has a bit of a complaint about these travels.

[01:30:59] Following up on the topic of travel, Ken asks Hans how he manages jet lag.

[01:34:56] Ken recommends for listeners, an app called Timeshifter for managing jet lag.

[01:35:04] Ken, Kevin and Hans wrap up the interview talking about jet lag.

Links:

Hans Van Dongen

Learn more about IHMC

STEM-Talk homepage

Ken Ford bio

Ken Ford Wikipedia page

Kevin Gluck bio

Today we have Dr. Rudolph E. Tanzi, who is perhaps best known for co-discovering all three familial early-onset Alzheimer’s disease genes. In addition, Rudy’s lab was the first to use human stem cells to create three-dimensional human brain organoids and three-dimensional neural-glial culture models of Alzheimer’s disease, which became known as “Alzheimer’s-in-a-Dish.” These models were the first to recapitulate all three of the key pathological hallmarks of Alzheimer’s disease and have made drug screenings faster and cheaper.

Rudy is the director of the Genetics and Aging Research Unit as well as the director of the Henry and Allison McCance Center for Brain Health. Rudy is also co-Director of the Massachusetts General Institute for Neurodegenerative Disease at Massachusetts General Hospital and serves as the Joseph P. and Rose F. Kennedy Professor of Neurology at Harvard Medical School.

Rudy has published more than 700 research papers and is one of the top 50 most cited neuroscientists in the world. He is author of “Decoding Darkness,” and a co-author of two books with Deepak Chopra, “Super Brain” and “The Healing Self.”

Show notes:

[00:03:18] Ken opens the interview mentioning that Rudy began playing the accordion when he was just seven years old. Ken goes on to ask Rudy about the time his father gave him a Jimmy Smith album and some advice.

[00:05:51] Ken mentions that, in addition to Rudy’s musical talents, he was also interested in science growing up. Ken asks about Rudy’s participation in the Westinghouse Science Talent Search and what that experience was like.

[00:07:09] Ken asks Rudy about growing up in Cranston, Road Island.

[00:08:39] Rudy talks about how he ended up at the University of Rochester after high school.

[00:09:51] Ken mentions that both Rudy’s grandfather and father passed away at the age of 45. Ken asks Rudy if this played a role in his pursuit of a career in genetics research.

[00:10:57] Rudy explains how he chose Harvard Medical School for his Ph.D.

[00:12:47] Ken pivots to ask Rudy about his time working with Jim Gusella in the early 80’s at Mass General, where they were the first to ever find a disease gene. Family studies at the time had shown that the Huntington’s disease gene was linked to a polymorphic DNA marker. Rudy talks about this discovery and how the chromosomal localization of the Huntington’s disease gene was the first step in using recombinant DNA technology to identify the primary genetic defect in this disorder.

[00:16:07] Ken asks Rudy about his work in 1987, when he discovered the first Alzheimer’s gene, recombinant DNA technology, which causes the production of amyloid. Ken goes on to explain that mutations in the APP gene can cause a rare form of early onset Alzheimer’s. Rudy talks about the paper that came out in “Science” that detailed this discovery.

[00:18:38] Rudy discusses his personal philosophy and approach to research.

[00:19:43] Ken mentions that in Rudy’s book, Decoding Darkness, he writes that few nightmares on Earth can compare to Alzheimer’s disease. Ken asks Rudy to talk more about this book.

[00:21:50] Ken explains that in the same way our physical capabilities will suffer some form of decline with age, it is also expected that we have some decline in memory and cognitive ability as we age as well. However, Ken goes on to say that when people begin to experience age-related memory lapses, it can lead to a lot of anxiety about their genetic predisposition to Alzheimer’s. Ken asks Rudy to talk about the lifestyle factors that play into whether someone predisposed to develop Alzheimer’s can stave off or avoid disease development.

[00:26:09] Ken explains that aging appears to intensify when people stop challenging themselves with new things. Given this, Ken asks Rudy what his thoughts are on challenging our brains as they age to protect our cognitive abilities.

[00:29:08] Ken asks Rudy about the principal advances in Alzheimer’s research that have occurred over the past few decades. He also asks Rudy for his thoughts on the biggest and most important mysteries that remain regarding Alzheimer’s.

[00:34:48] Ken brings up one of Rudy’s papers, published in 2014, which they successfully recapitulated amyloid-β and tau pathology in a single 3D human neural cell culture system. Ken goes on to mention that this paper had a huge impact in the field of research, and even landed Rudy a spot on Time Magazine’s 100 most influential people list.

[00:38:57] Ken mentions that in 2019, Rudy published another influential paper, which investigated the crosstalk between microglial receptor genes CD33 and TREM2. Ken explains that these two genes have been associated with an increased risk of Alzheimer’s disease, and that Rudy has referred to them as yin and yang to each other. Ken asks Rudy to elaborated on this concept.

[00:43:00] Ken pivots to discuss Rudy’s paper that was published last year and which the press somewhat misleadingly reported on. Ken explains that physical exercise has been shown to reduce amyloid beta in various Alzheimer’s models, but it is imperfectly associated with amyloid burden in humans. Ken goes on to explain that Rudy’s paper demonstrated, for the first time, a cellular and molecular mechanism by which exercise induced irisin attenuates amyloid beta pathology.

[00:46:27] Ken mentions that Rudy is currently writing a new book and mentions that some of Rudy’s previous books have been co-authored with Deepak Chopra. Ken asks how Rudy and Deepak came to work together.

[00:51:24] Ken asks, given the complex nature of Alzheimer’s and the many components that contribute to the pathology, if there is a way to organize all we know about Alzheimer’s in a straight-forward way.

[00:58:19] Ken asks if there are any particularly promising FDA approved drugs or nutraceuticals for stopping the production of amyloid.

[01:00:16] Ken asks if Rudy gets questions regarding which drugs and supplements screened have shown the most promise.

[01:03:33] Ken closes the interview by asking how he manages to be such a prolific scientist. Rudy has published more 700 papers while also having a lifetime of playing music with rock bands, working with sports teams and publishing New York Times best sellers.

Links:

Rudy Tanzi bio

Learn more about IHMC

STEM-Talk homepage

Ken Ford bio

Ken Ford Wikipedia page

Our guest today is Dr. Anurag Singh, the chief medical officer at Timeline Nutrition, a Swiss life-science company that focuses on ways to improve mitochondrial and cellular health. Anurag is particularly known for his research into the gut metabolite, urolithin-A, which has been shown to improve muscle strength, protect immune systems and optimize mitochondrial efficiency.

Anurag is an MD in internal medicine with a Ph.D. in immunology. He has led more than 50 randomized clinical trials, many of them focusing on urolithin-A over the past decade.

In today’s episode we talk to Anurag about his investigations into urolithin-A and the role it plays as a postbiotic that enhances mitochondrial function. Foods that contain the polyphenols needed to produce urolithin-A include pomegranates, strawberries, raspberries and walnuts.

Show notes:

[00:02:48] Marcas starts the interview by mentioning that Anurag grew up in India, in Lucknow, and asks what Anurag’s childhood was like.

[00:03:56] Marcas follows up, asking Anurag what he was like as a kid, given the competitive environment he grew up in.

[00:04:47] Ken asks Anurag if it is true that, at an early age, his parents noticed he was gifted in biology and encouraged him to think about pursuing medical school.

[00:05:47] Ken asks if Anurag started medical school at only 18 years of age.

[00:06:28] Marcas explains that Anurag went to India’s Armed Forces Medical College for training in internal medicine and asks if it is true that this is one of India’s top medical schools.

[00:07:07] Marcas explains that it is typical for graduates from the India Armed Forces Medical College to serve a few years in the Indian army after graduation. Marcas asks Anurag to tell the story of how he was able to go to the U.S. post-graduation rather than serving time in the army.

[00:08:00] Ken asks if Anurag’s interest in medical research led him to pursue a Ph.D. in immunology.

[00:08:56] Ken asks Anurag what his Ph.D. research was on.

[00:09:37] Marcas mentions that in 2009, Anurag accepted a position at Nestlé at a time when the company was entering into the space between food and pharma. Marcas asks Anurag how this move came about.

[00:11:20] Ken explains that Anurag quickly became medical director at Nestlé and started initiating clinical trials around food and allergies, as well as research on aging and how the immune system declines with age. Ken asks Anurag to explain what his time at Nestle was like.

[00:12:53] Marcas mentions how the shift from practicing physician to research scientist is an interesting course and asks Anurag to talk about a mentor who gave him the advice that led to his career shift.

[00:13:55] Ken mentions that in 2014 Anurag joined a Swiss company, Amazentis, as chief medical officer, and later became the lead for their medical and clinical research strategies. Ken asks Anurag to talk about the company and the work he does.

[00:15:00] Ken asks Anurag to describe the relationship between Amazentis and Timeline.

[00:15:42] Marcas asks Anurag to elaborate on his biotech approach to nutrition science, and how hard biology is used in his nutritional approaches at Amazentis.

[00:18:02] Marcas asks Anurag to give listeners an overview of the function and importance of mitochondria.

[00:19:15] Ken asks Anurag if there are any other benefits to good mitochondrial health, other than an increased energy supply.

[00:20:24] Ken asks Anurag to define the terms “mitochondrial biogenesis” and “mitophagy.”

[00:22:13] Marcas pivots to discuss age-related frailty and healthspan, specifically bringing up a study Anurag conducted on a Dutch population comparing active seniors to sedentary seniors.

[00:25:09] Ken mentions that Marcas likes to refer to exercise as medicine, given its potent effects on a wide variety of biomarkers. Ken asks Anurag to discuss the importance of exercise.

[00:26:59] Following up on the Dutch study, Marcas mentions that there is an explosion of research into healthspan, resilience, and even lifespan, and asks Anurag to discuss the core principles of healthy aging.

[00:29:14] Ken asks Marcas to give a brief aside as to the capacity, capabilities, and aims of IHMC’s new Healthspan Resilience and Performance complex.

[00:31:36] Ken mentions that poor metabolic health continues to be a growing global issue. Ken asks Anurag to share his thoughts on the issue.

[00:33:25] Marcas circles back to Anurag’s work at Timeline investigating natural compounds that target mitochondrial health. Marcas notes that Anurag and his colleagues found that urolithin-A outperformed every other molecule tested with respect to mitochondrial health. Urolithin-A is a natural compound produced by gut bacteria from metabolizing ellagitannins and ellagic acid, complex polyphenols found in foods such as pomegranates berries and nuts. Marcas asks Anurag to explain what these compounds are in detail.

[00:35:25] Marcas asks if there are lifestyle changes one can make to improve their gut microbiome population to increase how much urolithin A one can pull from food sources.

[00:37:07] Ken asks, assuming the hypothetically perfect microbiome and the perfect ellagitannin conversion, if it is possible through diet alone to produce enough urolithin A to observe considerable benefit.

[00:38:51] Marcas asks if any factors, other than chronic antibiotic use, have been shown to negatively affect the gut microbiome and its ability to produce urolithin-A.

[00:41:09] Marcas moves on to discuss Anurag’s 2016 paper titled “Urolithin-A induces mitophagy and prolongs lifespan in c-elegans and increases muscle function in rodents” Marcas asks Anurag to discuss the origins of this paper and the impact of its findings.

[00:44:18] Ken asks if the professor that Anurag partnered with on his 2016 paper ever investigated rapamycin as opposed to metformin.

[00:45:08] Ken asks if the primary mechanism of action regarding urolithin-A’s effect on mitophagy is known or if we have only seen a strong association with other mechanisms of mitophagy and autophagy.

[00:46:14] Marcas explains that in the progression of aging and a sedentary lifestyle, there is a decline in a cell’s ability to eliminate dysfunctional elements through autophagy and mitophagy. This decreased capacity specifically in skeletal muscle has been associated with poor muscle health and quality in older adults. Marcas asks about a 2019 paper Anurag wrote that detailed the results of his first human clinical trial in which he administered urolithin-A to sedentary but otherwise healthy adults.

[00:49:35] Marcas mentions that exercise also activates mitophagy, and asks if there are any key cellular, or mechanistic, differences between exercise and urolithin-A in their effects on mitochondrial health.

[00:50:49] Ken mentions that Anurag’s research on urolithin-A led to the development of Mitopure, which is the first postbiotic nutrient that has been shown to trigger mitophagy by targeting cellular decline. Ken goes on to mention that in 2022, Anurag published the paper “Urolithin-A improves muscle strength, exercise performance, and biomarkers of mitochondrial health in a randomized trial in middle aged adults” in which subjects were given oral doses of Mitopure. Ken asks Anurag to discuss this paper and its findings.

[00:54:37] Ken asks Anurag to discuss the specific contents of each package of Mitopure.

[00:56:19] Ken mentions that many therapies targeting mitochondrial health seem to only be effective when there is some defect or problem with the mitochondria. Ken asks Anurag’s why it seems that mitochondrial therapies can only return mitochondrial functioning to baseline rather than increase performance above baseline.

[00:58:15] Maras asks Anurag if he thinks that Mitopure is best used as a supplement to healthy lifestyle choices such as exercise, rather than a replacement for them.

[00:59:42] Ken pivots to talk about the sources of urolithin A, one of which being Iberian pigs, which consume a diet almost exclusively of acorns, which are rich in ellagitannins. Ken asks if the urolithin-A in Iberian pigs can be found in the ham meat itself.

[01:01:45] Marcas mentions Anurag’s paper published in the journal Aging Cell, which showed that Mitopure supplementation had potential to improve mitochondrial functioning in human cartilage. In this study, Anurag demonstrated that Mitopure supplementation for eight weeks, protected against osteoarthritic disease progression. Marcas asks Anurag to talk about this potential.

[01:04:03] Ken mentions that much of the research on urolithin-A has been conducted on its effects on skeletal muscle; however, urolithin-A also would be expected to have effects on other mitochondrially dense tissue as well. Ken asks if there has been any research on urolithin-A’s effects on tissues like liver or cardiac tissue.

[01:06:23] In response to Anurag mentioning the Buck institute’s research with urolithin-A, Ken mentions that we discussed urolithin-A at length with Buck institute researcher Julie Andersen on episode 118.

[01:07:34] Moving on to Anurag’s current research, Marcas asks about a randomized controlled trial in collaboration with the Buck Institute to see if urolithin-A can improve the immune health of middle-aged adults by improving mitochondria health.

[01:11:17] Ken asks about a recently completed randomized controlled trial looking at elite runners to determine whether overtraining induces mitochondrial dysfunction and whether urolithin-A has an impact on muscle recovery.

[01:14:40] Ken mentions that with all the interest growing in urolithin-A, there is an explosion of supplements on the market, which one cannot know the true composition or quality of. Ken asks Anurag if he has any advice for consumers who might want to try urolithin-A.

[01:17:28] Marcas closes the interview asking Anurag how he likes to spend his free time.

Links:

Anurag Singh bio

Anurag Singh ResearchGate

Learn more about IHMC

STEM-Talk homepage

Ken Ford bio

Ken Ford Wikipedia page

Marcas Bamman bio

Few people know as much about inflammation and neuroscience as Dr. Kevin Tracey does.

In this episode of STEM-Talk, we learn much from Tracey, who was the first to identify the inflammatory reflex, a physiological mechanism that regulates the body’s immune response to injury and invasion.

He is a neurosurgeon, a pioneer in bioelectrical medicine and president and CEO of the Feinstein Institutes for Medical Research in Manhasset, N.Y. The conversation in this episode covers a career spent working on “producing tomorrow’s cures today” in the treatment of inflammatory diseases, including:

[00:03:04] Dawn asks Kevin to tell the story of how he developed an interest in science that evolved into him becoming a neurosurgeon.

[00:04:56] Dawn mentions that Kevin was a curious youth and asks if it is true that after getting his first car, Kevin removed the entire engine because he wanted to better understand how to do a valve job.

[00:06:33] Ken mentions that after Kevin graduated from high school, he enrolled in Boston College where he earned a bachelor’s degree in chemistry. Ken explains that Kevin went to Boston University Medical School for his M.D. and asks Kevin about the transition.

[00:08:41] Ken asks if it is true that during Kevin’s first year at medical school his classmates had better luck finding him on the golf course than in the classroom.

[00:10:42] Dawn asks Kevin about his transition from medical school to the neurological surgery training program at New York Hospital, home of the Cornell University Medical College.

[00:13:11] Dawn pivots to talk about sepsis, which kills more than 350,000 people annually. She asks Kevin to discuss his tragic story of treating a patient with sepsis as a young neurosurgeon and how that changed the trajectory of his career.

[00:16:38] Ken explains that since the aforementioned incident, Kevin has focused on determining why septic shock occurs. Ken refers to a Ted Talk of Kevin’s in which he says, “good science begins with hard questions.” Ken asks Kevin to elaborate on this point.

[00:20:49] Dawn mentions that Kevin often describes himself as a brain surgeon who is fascinated by inflammation. Dawn asks Kevin how he responds when people ask him what inflammation is.

[00:22:29] Ken follows up by explaining that in 1987 Kevin made progress investigating inflammation with his discovery of tumor necrosis factor (TNF), which contributed to a new class of drugs for inflammatory and autoimmune diseases. Ken asks Kevin to discuss this discovery.

[00:25:56] Dawn mentions that in the late ‘90s, Kevin made another discovery that allowed him and his colleagues to merge neuroscience and immunology. Before getting into that discovery, Dawn asks Kevin to explain how humans have simple reflex circuits that harmonize the activity of our organs. She also asks him to talk about Charles Sherrington’s Nobel Prize-winning research, which laid the groundwork for contemporary neuroscience by showing how reflex circuits are the building blocks of our nervous system.

[00:29:50] Ken asks Kevin to elaborate on what monoclonal antibodies are, what disorders they can be used to treat, and what their potential benefits and downsides are.

[00:33:10] Dawn asks Kevin to talk about the discovery he made in the late 1990s, while studying the possibility of blocking TNF during a cerebral infarction or stroke by injecting a molecule that he and his colleagues developed directly into the brain.

[00:35:59] Ken mentions that after this discovery, Kevin started looking into well-established methods in neuroscience, such as those that link specific areas of the brain to specific cognitive functions and asks Kevin to discuss this research.

[00:39:45] Dawn explains that the insight that discrete brain regions control specific behaviors led Kevin to postulate that cutting the circuits connecting the brain and organs could reveal the identity of specific areas that control TNF. Dawn asks Kevin to walk through how he investigated this hypothesis.

[00:44:22] Ken asks Kevin to give an overview of the functions of the vagus nerve.

[00:46:00] Ken mentions that our show notes will provide a link to a short video that maps out the vagus nerve in detail. Ken goes on to mention that after Kevin looked into the relationship between TNF and the vagus nerve, he theorized that the TNF off signal from the vagus nerve completes a nerve circuit between the brain and the immune system. This finding had broad implications, and Ken asks Kevin to elaborate on them.

[00:50:57] Dawn mentions that Kevin wrote an article in 2002 for the journal Nature titled “The Inflammatory Reflex”, which emphasized the basic neural pathway that research had identified which reflexively monitors and adjusts the inflammatory response. Dawn goes on to mention that Kevin coined the term “inflammatory reflex” to describe how the nervous system monitors and controls the circuit to prevent the immune system from becoming overactive or underactive. Additionally, Kevin proposed in this article that it might be possible to activate neural anti-inflammatory mechanisms using small molecules to initiate signals in the central nervous system. Dawn asks Kevin to give an overview of the key insights into the inflammatory reflex he discussed in that article.

[00:54:15] Ken comments on the monumental importance of this paper to the field of neuro-immunology, and the treatment of inflammatory diseases, and asks Kevin what the response to this paper was.

[00:57:30] Dawn explains that Kevin has proposed that a dysregulated inflammatory reflex can lead to toxicity, tissue damage, and the presence of cytokines. It also can lead to miscommunication among cytokines leading to potential complications with autoimmune diseases. Dawn asks Kevin to talk about the process of testing this theory.

[01:00:54] Dawn asks Kevin about a sketch he drew while having lunch, which laid out how treating inflammatory diseases using a bioelectronic device might be possible.

[01:05:18] Ken pivots to talking about an influential 2016 paper that Kevin wrote on how the stimulation of the vagus nerve targeted the inflammatory reflex.

[01:08:23] Ken asks if there are any adverse effects suspected or identified for stimulating the vagus nerve in humans.

[01:12:02] Ken mentions that in writing about the vagus nerve Kevin has often talked about how the vagus nerve can get “out of tune.” Ken asks Kevin to explain how this occurs and what it means.

[01:14:41] Dawn mentions a study that Kevin spearheaded, which found that the dorsal motor nucleus is an important brain stem locus controlling anti-inflammatory signals and the inflammatory reflex. Dawn asks Kevin to discuss this study and how it was the first to demonstrate that neurons in the brain stem nuclei control the production of TNF.

[01:17:51] Dawn asks about a study Kevin and his colleagues conducted that looked at the use of an implanted vagus nerve stimulator in a small group of patients with Crohn’s disease.

[01:20:55] Ken asks Kevin what advances in bioelectronic medicine he envisions in the next decade.

[01:23:23] Ken mentions that the pharmaceutical industry is likely keeping a close eye on the development of bioelectronic medicine.

[01:24:25] Dawn mentions that Kevin is the president and CEO of the Feinstein Institute for Medical Research at Northwell Health, which has 50 research labs, and more than 5,000 researchers and staff on board. Dawn asks Kevin to talk about this research center and the range of work that goes on there.

[01:27:29] After mentioning that Kevin holds 120 U.S. patents, Ken asks Kevin about his ongoing tinkering and development of inventions.

[01:30:22] Dawn asks Kevin, with all the work he has on his plate, if he still finds time to golf.

Links:

Kevin Tracey bio

Feinstein Institutes for Medical Research

Learn more about IHMC

STEM-Talk homepage

Ken Ford bio

Ken Ford Wikipedia page

Dawn Kernagis bio

In today’s Ask Me Anything episode, Ken and Dawn answer a wide range of questions that cover:

[00:02:38] Dawn opens the episode with a question for Ken about the FDA’s recent approval of a neural implant device which is touted as a means of allowing people with degenerative neuromuscular disease, or spinal-cord injuries, to interface with external technology via neural signals. The listener asks Ken for his insights into what is being called “brain-computer interface technologies.”

[00:05:44] A listener asks Ken if he has a favorite science-fiction writer, or if there is a particular sci-fi series/story that really moves him.

[00:08:48] Multiple listeners ask Ken about a paper recently published titled: “APOE 4 Homozygosity Represents a Distinct Genetic Form of Alzheimer’s Disease.” Listeners ask if it is true that people with two copies of APOE4 allele are certain to develop the disease.

[00:19:30] A listener asks Ken about his time on the National Security Commission on Artificial Intelligence. The commission issued its report five years ago with specific recommendations on how the government should prepare for and defend against the national security implications of AI. Ken shares his thoughts on the implementation of the commission’s recommendations.

[00:21:16] A listener asks Dawn about her collaboration with Dr. Jeff Iliff that looked at a potential approach to optimizing glymphatic clearance for people with acute or chronic sleep deprivation.

[00:27:10] A listener asks Ken why more gyms and physical therapy centers don’t have blood flow restriction devices (BFR) available for their clientele, given that studies have shown that BFR improves strength and muscle mass in both young and older adults. (Two STEM-Talk episodes that cover blood-flow restriction include episode 34 and episode 161.

[00:28:38] A listener asks Ken for his thoughts on AI given the recent developments in the field, particularly in the realm of Generative AI, with programs like Chat GPT becoming a household name. The listener mentions that one of their friends thinks that AI is about to peak, and another says that AI is just getting warmed up.

[00:37:00] A listener writes that they are astounded at how many disorders can be treated with a ketogenic diet and mentions that they themselves have difficulty with a ketogenic diet. Instead, the listener eats low-carb diet and asks if the benefits of a low-carb, non-ketogenic diet are similar to a ketogenic one.

[00:38:19] A listener asks if Ken could talk about carotid scans and if this is a test that those with high LDL should consider getting.

[00:40:17] A 72-year-old listener explains how they structure their daily exercise routine between resistance and endurance training. The listener asks Ken whether they should focus more on resistance training as they are beginning to lose strength, and if so, how they should implement that given their age and the increasing risk for injury.

[00:45:51] To wrap up this episode, a listener asks Ken if he has any new annoyance that he would like to share, as he did in 2022, when he noted his disdain for the phrase “new normal” and the prevalence of cellphone addiction.

Links:

Learn more about IHMC

STEM-Talk homepage

Ken Ford bio

Ken Ford Wikipedia page

Dawn Kernagis bio

Today Dr. David LeMay steps in to co-host with Dr. Ken Ford for our interview with Dr. Charles Serhan. Charles is a Harvard professor best known for his discovery of specialized pro-resolving mediators. SPMs are molecules that can activate the natural resolution of inflammation and help people avoid anti-inflammatory drugs. The discovery of SPMs spurred a paradigm shift in our understanding of inflammation and human disease.

Charles is the Simon Gelman Professor of Anesthesia at Harvard Medical School and the director of the Center for Experimental Therapeutics and Reperfusion Injury at Brigham and Women’s Hospital. He also is a co-director of the Brigham Research Institute.

David, who was our guest on Episode 69 of STEM-Talk, is a sports medicine and rehabilitation physician with a Pensacola, Florida practice that focuses on lifestyle and performance medicine. He also is a visiting research scientist here at IHMC.

Show notes

[00:03:33] David opens the interview mentioning that Charles grew up in New York City with a passion for music. David explains that Charles learned to play the vibraphone in junior high and played professionally for a year before going to college. David asks Charles why he decided to pursue science instead of music.

[00:04:22] Ken asks Charles what kind of vibraphone he plays.

[00:06:02] Ken asks, aside from the desire to help people, if there was something particular about studying science that Charles really enjoyed.

[00:06:45] David asks about Charles’ experience at the State University of New York at Stonybrook studying biochemistry and immunohistochemistry.

[00:07:16] David asks if there was any carry over of skills for Charles from his career in music to his career in science.

[00:08:16] Ken mentions that after Charles earned his bachelor’s degree, one of his professors persuaded him to go to New York University for a master’s and Ph.D. Ken also mentions that at the time Charles worked in the lab of Gerald Wiseman at Woods Hole Marine Biological Laboratory and asks about that experience.

[00:12:37] David asks if this experience led Charles to a focus on neutrophil membrane remodeling for his Ph.D.

[00:13:59] David asks Charles if it was at the Karolinska Institute where he met his future wife.

[00:14:38] Ken asks Charles about one of his mentors, Michael Heidelberg, who gave Charles advice about how to be a good scientist.

[00:17:13] David explains that in the 1990’s Charles discovered Specialized Pro-Resolution Mediators and has since pioneered a new field on the utility of SPMs for a variety of inflammatory diseases.

[00:25:01] Ken backs up to ask Charles what drew him to study inflammation in the first place and how that led him to do more research on the subject than any other scientist.

[00:26:26] David asks Charles to touch on some different types of inflammation that the body experiences.

[00:35:12] Ken asks Charles about how a trip to Asia during which he developed a hole in his intestines, resulted in first-hand experience on the importance of controlling inflammation.

[00:41:00] David asks if Charles was taking any non-steroidal anti-inflammatory medications when he developed peritonitis.

[00:41:53] David asks Charles to explain what non-steroidal anti-inflammatory medications do to the healing process.

[00:45:35] David brings up a recent discovery in animal models that as animals age, their ability to produce resolution mediators declines, possibly contributing to the loss of muscle mass with age.

[00:48:09] Ken asks Charles to talk about the explosion of research into the potential therapeutic applications of SPMs in the treatment of a variety of chronic diseases known to be driven in part by chronic inflammation.

[00:51:06] David asks Charles to explain the differences between resolvins, protectins, and maresins, as well as what role each plays in the healing process.

[00:56:04] Ken mentions a review article that Charles published in 2017 in the Journal of Molecular Aspects of Medicine, which looked at SPMs and their capacity to change pharmacology through resolution physiology.

[01:00:22] David asks Charles to explain the difference between inflammation and resolution.

[01:03:13] Ken asks Charles to give an overview of the research he is currently conducting at the Serhan Laboratory.

[01:05:50] David asks Charles about a paper he published last year in the Proceedings of National Academy of Sciences titled: “Resolvin D1 Prevents Injurious Neutrophil Swarming in Transplanted Lungs.” This provided insights for therapeutically enhancing pro-resolution pathways to minimize early leukocyte mediated tissue injury and promote healing following transplantation.

[01:08:43] David asks Charles if the aforementioned use of Resolvin D1 works for ailments such as ischemic stroke or ischemic myocardium after a cardiac event. Charles brings up a paper by Gabrielle Fredman that explored the use of resolvins to reduce inflammation in atherosclerosis.

[01:13:10] David mentions that Charles has three children, two of whom are in the military and asks for Charles’ thoughts on the use of SPMs in military populations.

[01:17:04] David asks Charles if there might be any protective effects of taking SPMs prior to or during exposure to extreme environments.

[01:17:48] Ken comments on Charles’ use of the phrase “nutritional armor,” coined by Joe Hibbeln. Charles talks about his experience working with Joe over the years.

[01:19:00] Ken recounts an experience when he was a member of the Defense Science Board and invited Joe Hibbeln to present his nutritional armor concept to the Board.

[01:22:05] David mentions that for the sports science world, recovery is a big focus. David asks if resolution is a more appropriate way to approach this issue than traditional anti-inflammatory interventions.

[01:23:33] David follows up asking Charles what the role of sleep is in resolution.

[01:24:57] David shares some of his experience using SPMs in his practice, and Ken mentions his own personal use of SPMs. Charles discusses how SPMs are derived and the importance of supplementation.

[01:31:04] Ken mentions that there were two books that Charles found very influential in his early career, “The Art of Scientific Investigation,” and “Men Like Gods.” Ken asks how these books impacted Charles, and if he still recommends them to young scientists and graduate students.

Links:

Charles Serhan bio

Learn more about IHMC

STEM-Talk homepage

Ken Ford bio

Ken Ford Wikipedia page

David LeMay bio

Dave Feldman is the founder of the Citizen Science Foundation and is known for his research into the ketogenic diet. Dave is a software engineer by training who embraced a ketogenic diet to avoid his progression toward type 2 diabetes. he joins us on this episode of STEM-Talk to share that journey.

After undertaking the high-fat/low-carbohydrate diet, Dave’ LDL cholesterol spiked. Dave used his training as an engineer to start learning everything he could about cholesterol and lipids. What he learned led him to create the website Cholesterol Code, a research hub for information and emerging data on cholesterol, particularly in the context of a low-carbohydrate lifestyle.

Dave’s Citizen Science Foundation is designed to support projects and research that promote collaborative efforts across multiple disciplines, both in and outside formal scientific institutions.

Show notes:

[00:02:53] Dawn opens the interview asking Dave what he was like as a kid.

[00:03:44] Dawn mentions that Dave divided his time as a child between Denver and Wichita due to his parents’ divorce and asks Dave what the best part of his childhood was.

[00:04:28] Ken mentions that Dave has described both his parents as graphic artists and Bohemian, “hippie spirit” types. Ken asks what he learned from them that fueled his interests and goals.

[00:05:46] Ken asks about Dave’s first computer, which was a Commodore 64, as well as his early experience with computers.

[00:08:50] Dawn mentions that Dave’s interest in computers came in a time before the internet and asks what he learned about computing in those days.

[00:10:51] Dawn explains that since Dave grew up in the 1980s, there was not much in the way of computer science curriculum in schools and asks Dave how he supported his interest in programming.

[00:12:33] Ken asks Dave about how self-directed learning has been a theme throughout his whole life.

[00:14:35] Dawn asks Dave about his childhood hobbies, including running and competitive storytelling.

[00:17:01] Ken asks how Dave’s experiences in forensic debate in high school helped his career later in life.

[00:18:56] Dawn mentions that Dave initially attended film school and asks if it is true that Dave’s side hustle of doing contract software work overtook his original plan to graduate.

[00:20:49] Dawn asks about Dave’s experiences working in the game platform development business in Las Vegas, as well as what these experiences taught him.

[00:22:23] Ken asks Dave about a “the piece of paper” that Dave says changed his life in 2015.

[00:28:58] Ken follows up, asking Dave if he checked his LDL-P or his ApoB at the same time as his cholesterol levels.

[00:30:37] Ken mentions that he knows some people that when consuming a ketogenic diet did not see a substantial increase in LDL-C, but did experience a substantial elevation of LDL-P.

[00:35:03] Ken pivots to discuss a paper that Dave and others published in Current Developments in Nutrition in 2022 titled: “Elevated LDL Cholesterol with a Carbohydrate-Restricted Diet: Evidence for Lean Mass Hyper-Responder Phenotype.” Ken asks Dave to describe what it means to be a lean mass hyper-responder.

[00:40:19] Ken mentions his caution against the term lean mass hyper-responder, as it is unclear what “lean mass” refers to in this case. Ken goes on to say that while the lean mass hyper-responder phenotype can be objectively measured in terms of LDL, HDL and triglyceride levels, the lean mass aspect is often measured in these studies with BMI, which is unable to measure body composition. Ken asks Dave what his thoughts are on this and if he would like the possibility of moving away from BMI and towards DEXA scans.

[00:43:37] Ken mentions that Dave’s original article describing the lean mass hyper-responder phenotype has received a lot of response from individuals claiming to fall into that category. While it is difficult to get a precise estimate of the population that fits this phenotype, Ken asks Dave what he thinks the percentage might be.

[00:47:33] Dawn asks about the case report published in Frontiers in Endocrinology in 2022 titled: “Case Report: Hypercholesterolemia, Lean Mass Hyper-Responder Phenotype Presents in the Context of a Low Saturated Fat Carbohydrate-Restricted Diet.” This paper highlights the case of a hyper-responder who adopted a ketogenic diet to manage ulcerative colitis.  

[00:49:38] Ken asks how long the subject of the case report was on an extremely low-carb diet.

[00:50:48] Ken asks Dave, given that cholesterol levels and lipoproteins are remarkably elevated in lean mass hyper-responders, what he thinks the cumulative cardiovascular implications over an extended period might be.

[00:56:19] Dawn turns to discuss Dave’s 2022 paper on the Lipid Energy Model, titled: “Lipid Energy Model: Reimagining Lipoprotein Function in the Context of Carbohydrate Restricted Diets,” asking him to expound on the concept and its significance.

[00:59:02] Ken remarks on the extraordinarily fast review process for this paper on the Lipid Energy Model, explaining that the paper went through submission, review, revision, acceptance and publishing in 30 days.

[01:00:49] Dawn shifts to ask about a 2023 study by Dr. Isabella Cooper in Frontiers in Endocrinology titled: “Thyroid Markers and Body Composition Predict LDL Cholesterol Change in Lean Healthy Women on a Ketogenic Diet: Experimental evidence for the Lipid Energy Model.”

[01:02:48] Ken asks Dave about his journey to self-fund research through crowdfunding, for which he founded a 501c3 non-for-profit, which in 2019 was named the Citizen Science Foundation. Ken asks Dave what challenges he faced in this endeavor.

[01:05:47] Ken asks Dave to describe how he came to partner with the Lundquist institute at UCLA.

[01:08:33] Ken asks what the state of the Citizen Science Foundation is now, and if it has any projects that it is currently funding.

[01:09:57] Ken asks Dave how he sees the foundation evolving in the future and how he would like it to evolve.

[01:11:50] Dawn asks Dave about a study he and his team have just completed on 100 lean mass hyper-responders who received a CT Angiogram to establish baseline coronary artery status, and then a second scan a year later. Dawn asks Dave to discuss the findings of this study in terms of atherosclerotic plaque in the hyper-responder group as compared to the Miami Heart Study group, as well as the overall findings of the study.

[01:17:36] Ken follows up, asking if the results of the aforementioned study will be published soon.

[01:17:54] Dawn asks Dave about the documentary he is working on.

[01:19:53] Dawn closes the interview asking Dave why The Usual Suspects by Brian Singer is his favorite film.

Links:

Dave Feldman bio

Learn more about IHMC

STEM-Talk homepage

Ken Ford bio

Ken Ford Wikipedia page

Dawn Kernagis bio