Mind & Matter

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Short Summary: A deep dive into the science of oxidative stress, antioxidants, aging, and neurodegenerative diseases like Alzheimer’s.

About the guest: Pamela Maher, PhD is a professor at the Salk Institute in San Diego, California, with a focus on neurodegenerative diseases, oxidative stress, and antioxidants.

Note: Podcast episodes are fully available to paid subscribers on the M&M Substack and everyone on YouTube. Partial versions are available elsewhere. Full transcript and other information on Substack.

Episode Summary: Dr. Pamela Maher discusses her research on cell death mechanisms, including apoptosis and ferroptosis, and their roles in health and disease. They discuss how oxidative stress from reactive oxygen species can damage cells, the body’s antioxidant defenses like glutathione and studies on natural compounds—fisetin, curcumin, and cannabinol (CBN)—that may protect against brain cell loss. The conversation covers CBN’s mitochondrial benefits in aging mouse models and broader risk factors for dementia, like obesity and hearing loss, emphasizing early intervention.

Key Takeaways:

• Apoptosis is a controlled cell death process vital for development, while ferroptosis, linked to oxidative stress and iron, causes cells to burst and is tied to diseases like Alzheimer’s.
• Oxidative stress arises when reactive oxygen species overwhelm antioxidants, damaging DNA, proteins, and cell membranes, especially polyunsaturated fats.
• Glutathione, a key antioxidant, relies on cysteine and declines with age, but supplements like N-acetylcysteine might help, though tolerability varies.
• Cannabinol (CBN), a THC byproduct, protects mitochondria and improves memory in aging mice, hinting at therapeutic potential beyond cannabinoid receptors.
• Middle-age risk factors like visceral obesity, type 2 diabetes, and hearing loss significantly increase dementia risk, but hearing aids can reduce it.

Related episode:

• M&M #165: PUFAs in Brain Health & Disease, Dietary Fats, Brain Lipids, Nutrition | Richard Bazinet

*Not medical advice.

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Short Summary: A detailed examination of shamanism with anthropologist Manvir Singh, blending evolutionary theory and vivid storytelling.

About the guest: Manvir Singh, PhD is an anthropologist at the University of California, Davis. His new book, "Shamanism: The Timeless Religion," comes out on May 25, 2025.

Note: Podcast episodes are fully available to paid subscribers on the M&M Substack and everyone on YouTube. Partial versions are available elsewhere. Full transcript and other information on Substack.

Episode Summary: Dr. Manvir Singh discusses shamanism’s role as a universal human practice, exploring its roots in cultural evolution, cognitive tendencies, and persistence across history and modern society. They discuss how shamans use altered states to address uncertainty—like healing or divination—while examining shamanism’s interplay with centralized religion, its psychological benefits, and parallels in today’s world, from tech gurus to medical placebos.

Key Takeaways:

• Shamanism is a widespread cultural practice involving specialists who enter altered states to engage with unseen forces, often for healing or managing uncertainty.
• It’s not an archaic precursor to modern religion but a recurring expression of spiritual beliefs & practices, competing with other forms.
• Techniques vary widely—dance, music, psychedelics—but only about half of shamans historically used psychoactive substances.
• Modern parallels include tech CEOs and money managers who project exceptionalism to influence others, echoing shamanic charisma without trance.
• Open-label placebos (where patients know it’s fake) still work, suggesting rituals alone can trigger healing, much like shamanic practices.
• Singh sees shamanism as a cognitive technology, not inherently good or bad, shaping how we cope with chaos across cultures and time.

Related episode:

• M&M #86: Shamanism, Psychedelics, Social Behavior, Religion & Evolution of Human Culture | Michael Winkelman

*Not medical advice.

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Short Summary: How environmental chemical exposures affect neurodegenerative disease and health.

About the guest: Gary Miller, PhD is a Professor of Environmental Health Sciences at Columbia University. His research bridges pharmacology, toxicology, and neuroscience to explore neurodegeneration, particularly Parkinson’s and Alzheimer’s diseases.

Note: Podcast episodes are fully available to paid subscribers on the M&M Substack and everyone on YouTube. Partial versions are available elsewhere. Full transcript and other information on Substack.

Episode Summary: Dr. Gary Miller talks about neurodegenerative diseases like Parkinson’s and Alzheimer’s, exploring their age-driven nature, early detection challenges, and environmental risk factors such as pesticide exposure and head trauma. They discuss the emerging field of exposomics—studying lifetime chemical exposures—and its potential to uncover links between pollutants, diet, and disease, while highlighting protective factors like caffeine and nicotine, and the role of technology in advancing prevention and treatment.

Key Takeaways:

• Neurodegenerative diseases like Parkinson’s & Alzheimer’s worsen with age, but early intervention could slow progression & improve quality of life.
• Parkinson’s symptoms often appear after significant dopamine neuron loss, but subtle signs like handwriting changes or gait issues might be detectable earlier.
• Environmental factors, including pesticides & air pollution, increase neurodegeneration risk, while caffeine and nicotine surprisingly lower Parkinson’s incidence.
• The exposome—total lifetime exposure to chemicals—offers a new lens to study health, revealing how pollutants & diet interact with our biology.
• Ultra-processed foods & common chemicals like PFAS (in packaging) raise exposure levels, but simple steps like air filters or less processed diets can help reduce risks.

Related episode:

• M&M #145: Epigenetics, Hormones, Endocrine Disruptors, Microplastics, Xenoestrogens, Obesogens & Obesity, Inheritance of Acquired Characteristics | Bruce Blumberg

*Not medical advice.

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Short Summary: Do elephants and other animals have language-like abilities, such as the ability to use individual names to refer to themselves and others?

About the guest: Michael Pardo, PhD studies animal behavior at Cornell University, where he focused on animal communication and cognition. His work includes extensive field research with African elephants in Kenya.

Note: Podcast episodes are fully available to paid subscribers on the M&M Substack and everyone on YouTube. Partial versions are available elsewhere. Full transcript and other information on Substack.

Episode Summary: Michael Pardo, PhD talks about his research on animal communication, focusing on whether African savanna elephants use vocal "names" to address each other. They explore the broader context of vocal communication across species like dolphins, parrots, and marmosets, discussing how these systems compare to human language and what they reveal about its evolution. Dr. Pardo shares details of his fieldwork in Kenya, elephant social structures, and their behaviors like mourning the dead, while also touching on the challenges and joys of studying animals in their natural habitats.

Key Takeaways:

• Elephants may use unique vocal rumbles to address specific individuals.
• Dolphins use signature whistles as "calling cards," sometimes imitating others’ whistles to get their attention, hinting at a form of naming.
• Elephant society features female-led family groups and dispersing males.
• Elephants show intriguing behaviors like visiting carcasses and covering them with dirt, suggesting an awareness of death uncommon in most animals.
• Human language evolution may have evolved gradually from simpler communication systems, as seen in various species, rather than emerging suddenly.
• Studying less charismatic animals like chickens could uncover surprisingly complex communication, broadening our understanding of cognition in nature.

Related episode:

• M&M #20: Language, Symbolic Cognition, Evolution, Origins of the Human Mind | Terrence Deacon

*Not medical advice.

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Short Summary: The science of cancer and immunity with Dr. Roychoudhuri, blending cutting-edge research with everyday implications like aspirin’s role in fighting tumor metastasis.

About the guest: Rahul Roychoudhuri, PhD is a Professor of Cancer Immunology at the University of Cambridge. His research bridges basic science and clinical applications, focusing on immune responses to cancer development and spread.

Note: Podcast episodes are fully available to paid subscribers on the M&M Substack and everyone on YouTube. Partial versions are available elsewhere. Full transcript and other information on Substack.

Episode Summary: The immune system’s role in detecting and fighting cancer, particularly how cancer cells evade immunity through selection pressures and microenvironment manipulation. They explore cancer initiation via mutations and inflammation, metastasis mechanics, and a surprising link between low-dose aspirin and reduced cancer spread, spotlighting new research on T cells and thromboxane. The discussion ties in dietary fats, aspirin’s anti-inflammatory and anti-clotting effects, and the potential for new therapies to prevent metastasis.

Key Takeaways:

• The immune system constantly surveils and eliminates early cancer cells, but surviving cancers evolve to dodge detection.
• Inflammation can both spark cancer growth and be exploited by tumors to suppress helpful immune responses.
• Cancer metastasis, responsible for ~90% of cancer deaths, involves cells breaking off, traveling, and adapting to new sites.
• New research shows aspirin may curb metastasis by lowering thromboxane, a lipid-derived blood clotting factor.
• Human data hints aspirin reduces metastasis risk in cancers like breast and colorectal, but trials are ongoing.
• Daily low-dose aspirin (75-100 mg) is used for heart health, yet its cancer benefits need more study. 600 mg per day has been observed to reduce metastasis rates in colon cancer patients, but chronic use of that dose carries some risk (ulcers, bleeding).

*Not medical advice.

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How dietary fructose affects the growth rate of cancer.

About the guest: Gary Patti, PhD is a professor at Washington University in St. Louis, holding appointments in chemistry, medicine, and genetics

Episode Summary: Nick Jikomes talks to Dr. Patti, exploring how cancer cells metabolize sugars like glucose and fructose, focusing on a recent study showing fructose indirectly boosts tumor growth in mice via liver-produced lipids called LPCs. The discussion covers cancer biology basics, Warburg effect, tumor microenvironments, and systemic metabolic impacts of cancer, while also touching on dietary implications, fasting, and the complexities of nutrient use in cancer progression.

Key Takeaways:

• Cancer cells often rely heavily on glucose, excreting it as lactate even when oxygen is available (Warburg effect), but take up more than their mitochondria can handle.
• In a study, high fructose diets accelerated tumor growth in mice by 4x, not because cancer cells use fructose directly, but because the liver converts it to LPCs, which tumors use to build membranes.
• Tumors are not just cancer cells; they recruit healthy cells in their microenvironment, and their metabolic effects ripple across the entire body, altering distant tissues.
• Excessive fructose consumption may worsen tumor growth, but cutting it poses little risk and could benefit cancer patients, pending human studies.
• Fasting may reduce cancer initiation risk in animals, but its effect on existing tumors is less clear and could worsen wasting (cachexia) in late stages.
• The body tightly regulates blood glucose via the liver, so simply cutting dietary glucose won’t starve tumors, highlighting cancer’s metabolic adaptability.

Related episode:

• M&M #200: Dietary Fats & Seed Oils in Inflammation, Colon Cancer

*Not medical advice.

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Short Summary: How diet shapes the gut microbiome and impacts health, with microbiologist Dr. Peter Turnbaugh breaking down the complex science.

About the guest: Peter Turnbaugh, PhD is a professor of microbiology and immunology at the University of California, San Francisco, where he leads a lab studying the gut microbiome’s role in nutrition and drug response.

Note: Podcast episodes are fully available to paid subscribers on the M&M Substack and everyone on YouTube. Partial versions are available elsewhere. Full transcript and other information on Substack.

Episode Summary: Nick talks to Peter Turnbaugh discuss the pitfalls of oversimplified diet labels in research, Turnbaugh’s studies comparing plant-based and animal-based diets in humans, and how these shifts rapidly alter gut microbes and short-chain fatty acid profiles. 

Key Takeaways:

• The term “high-fat diet” in research is often misleading, as it can include high carbs and vary widely, complicating study comparisons.
• In a 2014 study, switching humans to a plant-based (high-fiber) or animal-based (ketogenic, no-fiber) diet changed their gut microbiome within one day, showing its remarkable adaptability.
• Ketogenic diets reduce Bifidobacterium in the gut, which may lower inflammation-linked immune cells (Th17), potentially aiding conditions like multiple sclerosis.
• Short-chain fatty acids (e.g., butyrate) don’t just come from fiber; they persist even on zero-fiber ketogenic diets, hinting at alternative microbial pathways.
• Gut microbes can activate or deactivate drugs, like antibiotics or digoxin, suggesting microbiomes may explain why drugs work differently across individuals.
• Ketone bodies like BHB alone can mimic some ketogenic diet effects on the microbiome and immunity, simplifying research and hinting at therapeutic potential.

Related episode:

• M&M #203: Metagenomics, Microbiome Transmission, Gut Microbiome in Health & Disease | Nicola Segata

*Not medical advice.

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Short Summary: The science of diabetes with Dr. Scott Soleimanpour, blending personal insights and cutting-edge research that gets into mitochondrial biology and more.

About the guest: Scott Soleimanpour, MD, is a physician-scientist at the University of Michigan, where he runs a lab studying pancreatic beta cell biology and mitochondrial quality control in diabetes.

Note: Podcast episodes are fully available to paid subscribers on the M&M Substack and everyone on YouTube. Partial versions are available elsewhere. Full transcript and other information on Substack.

Episode Summary: Nick Jikomes interviews Dr. Scott Soleimanpour about the biology of diabetes, exploring the pancreas’s dual role in digestion and blood sugar regulation via beta cells, which produce insulin. They discuss type 1 diabetes as an autoimmune condition with rising incidence and complex beta cell issues, and type 2 as a progressive disease tied to beta cell failure, not just obesity. The conversation covers mitochondrial function in beta cells, lifestyle factors like diet, and the limits of current treatments, offering practical advice for prevention and management.

Key Takeaways:

• The pancreas has two parts: the exocrine (98%) makes digestive enzymes, while the endocrine (1-2%) regulates blood sugar with hormones like insulin from beta cells.
• Type 1 diabetes involves autoimmunity and intrinsic beta cell defects, with rates increasing due to environmental factors, not just genetics.
• Type 2 diabetes hinges on beta cell dysfunction, not obesity alone—only 1 in 5 overweight people develop it, showing other factors matter.
• Beta cells are energy-intensive and long-lived, relying on mitochondria; stress from overwork (e.g., excess insulin demand) can lead to failure.
• Current diabetes drugs don’t rejuvenate beta cells; only TZDs (rarely used) preserve function, highlighting a gap in treatment.

Related episode:

• M&M #140: Obesogens, Oxidative Stress, Dietary Sugars & Fats, Statins, Diabetes & the True Causes of Metabolic Dysfunction & Chronic Disease | Robert Lustig

*Not medical advice.

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Short Summary: A rare, insider’s look at the messy realities of scientific research with Stanford’s Dr. John Ioannidis. The good, the bad, and the ugly about how scientific research actually works.

About the guest: John Ioannidis, MD, PhD is a professor at Stanford University in medicine, epidemiology, population health, and biomedical data science, with an MD from the University of Athens and a PhD from Harvard in biostatistics. He directs the Meta-Research Innovation Center at Stanford (METRICS), focusing on improving research methods and practices. Renowned for his paper “Why Most Published Research Findings Are False,” he’s among the most cited scientists globally, tackling biases and reproducibility in science.

Note: Podcast episodes are fully available to paid subscribers on the M&M Substack and everyone on YouTube. Partial versions are available elsewhere. Full transcript and other information on Substack.

Key Takeaways:

• Science’s “replication crisis” isn’t new—it’s baked into how tough and bias-prone research is, hitting all fields, not just “soft” ones like psychology.
• Ioannidis’s famous claim, “most published findings are false,” holds up: stats show many “significant” results are flukes due to weak studies or bias.
• Peer review’s a mixed bag—only a third of papers improve, and unpaid, tired reviewers miss a lot, letting shaky stuff slip through.
• Publishing’s a $30 billion game with 50,000+ journals; big players like Elsevier rake in huge profits from subscriptions and fees, often over $10,000 per paper.
• Researchers game the system—think fake co-authorships or citation cartels—boosting metrics like the H-index, which tracks papers with matching citation counts.
• Ioannidis’s early COVID-19 fatality rate (0.2-0.3%) was spot-on but sparked a firestorm as politics warped science into “clan warfare.”
• NIH funding’s clogged by red tape and favors older researchers, starving young innovators and risky ideas that could shake things up.
• He’s building tools like a public database of scientist stats (4 million downloads!) to spotlight gaming and push for transparent, fair research.

*Not medical advice.

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• Good Chemistry: Personalized, science-based health consulting. Work with Dr. Nick Jikomes directly.
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Short Summary: Personalized health monitoring with Professor Michael Snyder, blending cutting-edge science with practical tips and actionable insights.

About the guest: Michael Snyder, PhD is a Professor of Genetics at Stanford University School of Medicine. He directs the Center for Genomics and Personalized Medicine, which focuses on big data and health innovation. Snyder holds a PhD from Caltech and completed postdoctoral work at Stanford. His career has spanned yeast genomics to human health profiling. Currently, he leads research on advanced molecular and wearable technologies while spinning off companies like Q Bio to translate findings into real-world health solutions.

Note: Podcast episodes are fully available to paid subscribers on the M&M Substack and everyone on YouTube. Partial versions are available elsewhere. Full transcript and other information on Substack.

Episode Summary: Nick talks to Dr. Michael Snyder about transforming medicine through personalized health monitoring, leveraging tools like wearables, continuous glucose monitors, and deep molecular profiling. They explore how diet, microbiome, and genetics shape metabolic health, delving into Snyder’s research on diabetes subtypes, short-chain fatty acids, and aging patterns. The conversation also covers practical technologies available today, like smartwatches and home blood tests, and their potential to catch diseases early and extend healthy lifespans.

Key Takeaways:

• Medicine is shifting from sick care to proactive health care using comprehensive data from wearables and molecular profiling.
• Diabetes has many subtypes, not just type 1 or 2, and treatments like drugs or diet should match an individual’s specific profile.
• Dietary fiber boosts gut health by producing short-chain fatty acids, which influence gene expression and may reduce leaky gut risks.
• Aging isn’t linear—big changes spike in the 40s and 60s, varying by person (e.g., heart, kidneys, metabolism), offering chances to adjust lifestyles early.
• Wearables like fitness watches can detect illnesses (e.g., COVID, Lyme) days before symptoms by tracking heart rate shifts.
• Continuous glucose monitors reveal surprising food responses, guiding personalized diets.

*Not medical advice.

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• Good Chemistry: Personalized, science-based health consulting. Work with Dr. Nick Jikomes directly.
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