Mind & Matter

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A metabolic view of Alzheimer's disease & the recent discovery of compounds that reverse advanced disease symptoms in mouse models by restoring mitochondrial health.

TOPICS DISCUSSED:

• Classic Alzheimer’s pathology: amyloid plaques and tau tangles identified over 120 years ago, long assumed to drive irreversible neuron loss.
• Limitations of amyloid focus: plaques appear in some cognitively normal brains; antibody therapies have shown limited clinical benefit.
• Metabolic perspective: brain energy failure as a tipping point where repair mechanisms are overwhelmed, linking genetics, injury, and aging.
• Neuroprotection via P7C3 compounds: discovered through hippocampal neurogenesis screen; preserves mitochondrial function and normalizes NAD/NADH ratio without elevating NAD excessively.
• Recovery in models: treatment after symptom onset reversed cognitive deficits, blood-brain barrier damage, oxidative stress, and axon issues in amyloid and tau mouse models, despite persistent plaques.
• Broader implications: energy restoration enables surviving neurons to function; similar protective effects seen in TBI and other organs under stress.

ABOUT THE GUEST: Andrew Pieper, MD, PhD, is a board-certified psychiatrist and neuroscientist, professor at Case Western Reserve University, and director of the Brain Health Medicines Center at the Harrington Discovery Institute. He directs a research group focused on neuroprotection after brain injury and neurodegenerative disease.

RELATED EPISODE:

• M&M 208: Glyphosate, Choline & Alzheimer’s: Toxins & Nutrition to Prevent Neurodegeneration | Ramon Velazquez

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How exercise in parents can improve the metabolic and cardiovascular health of their offspring through epigenetic mechanisms.

TOPICS DISCUSSED:

• Parental exercise & offspring metabolic health: exercise before and during pregnancy improves glucose tolerance and reduces fat gain in offspring.
• Paternal effects via sperm: moderate voluntary wheel running alters small non-coding RNAs, especially tRNA fragments, in sperm and enhances glucose clearance, with stronger benefits in female offspring.
• Maternal exercise mechanisms: benefits arise from in utero environment, placental changes, and breast milk composition rather than major oocyte alterations.
• Human milk oligosaccharides: exercise increases 3’-sialyllactose in milk, linked to better offspring microbiome and metabolic outcomes.
• Sex-biased & intergenerational effects: maternal exercise impacts male offspring metabolism more; effects can transmit to F2 generation depending on the transmitting parent’s sex.

ABOUT THE GUEST: Kristin Stanford, PhD is an associate professor in the Department of Physiology and Cell Biology at The Ohio State University Wexner Medical Center, where she serves as associate director of the Diabetes and Metabolism Research Center. Her lab investigates molecular mechanisms by which exercise enhances metabolic and cardiovascular health, with a focus on intergenerational effects.

RELATED EPISODE:

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

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How the vagus nerve regulates inflammation; bioelectronic therapies to treat inflammatory conditions.

Nick speaks with Dr. Kevin Tracey about inflammation as a major driver of modern diseases, the vagus nerve’s role in balancing immune responses via reflexes, limitations of anti-cytokine drugs, and emerging bioelectronic medicine using targeted nerve stimulation.

TOPICS DISCUSSED:

• Inflammation is related to diseases that contribute to most deaths today: heart disease, diabetes, neurodegeneration, and cancer.
• Molecular signals involved in inflammation, such as cytokines.
• Homeostasis is maintained by push-pull mechanisms, with excitatory and inhibitory responses co-deployed in ways that maintains balance.
• The vagus nerve’s anatomy, sensory/motor fibers, and the inflammatory reflex that suppresses cytokine production in the spleen via acetylcholine and norepinephrine.
• Vagus nerve stimulation devices delivering brief daily pulses to reduce inflammation without broad immunosuppression, now FDA-approved for refractory rheumatoid arthritis.
• Challenges in measuring inflammation and oversimplifications online about “stimulating” the vagus nerve.

ABOUT THE GUEST: Kevin Tracey, MD is a neurosurgeon, president and CEO of the Feinstein Institutes for Medical Research at Northwell Health, and professor of molecular medicine and neurosurgery. He discovered the inflammatory reflex, showing how the vagus nerve controls immune responses, and co-founded SetPoint Medical to develop FDA-approved vagus nerve stimulation for rheumatoid arthritis.

RELATED EPISODE:

• M&M 143: Gut-Brain Communication, Vagus Nerve, Fats & Sugars, Food Addiction, Gut Hormones & Weight Loss Drugs | Will de Lartigue

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How light regulate circadian rhythms, mitochondrial function, hormones, and appetite.

Nick & Dr. Alexis Cowan discuss non-image-forming effects of light on the body, from melanopsin-driven circadian signaling in the eye to UV-stimulated pathways in skin and brain that influence melatonin, cortisol, melanin production, and energy balance.

TOPICS DISCUSSED:

• Melanopsin & non-image-forming light: blue light signals daytime to the SCN master clock, suppressing melatonin and promoting alertness.
• UV light, POMC & peptide hormones: UVB exposure in skin and hypothalamus produces alpha-MSH (reduces appetite, boosts energy expenditure) and beta-endorphin (improves mood), independent of vitamin D.
• Mitochondrial effects of light: red/infrared supports function like a gas pedal; isolated blue light acts as brakes, impairing energy production and biophoton signaling.
• Artificial light: Evening blue light from screens inhibits melatonin, poisons mitochondria, and creates discordant timing signals versus balanced natural sunlight.
• Melanin beyond skin: produced via UVB, it harnesses energy, buffers oxidative stress, and links to dopamine pathways; low sun exposure ties to metabolic issues and conditions like Parkinson’s.
• Vitamin D as biomarker: supplementation shows limited benefits because it reflects broader UVB-driven processes, not a standalone fix.

ABOUT THE GUEST: Alexis Cowan, PhD earned her PhD in molecular biology at Princeton in the Rabinowitz lab, a leading metabolism research group, where she studied fasting, ketogenic diets, and exercise; she completed a postdoc at UPenn before shifting focus to circadian and quantum biology. She now educates on light, mitochondria, and quantum biology.

RELATED EPISODE:

• M&M 221: Regenerative Energy & the Light Inside You | Jack Kruse

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Is the fundamental purpose of sleep to remove oxidized fats from the brain?

Nick & Dr. Amita Sehgal talk about the latest science on why animals sleep. Using fruit flies, her lab shows that waking generates oxidized lipids in neurons that are shuttled to glia and then cleared by macrophage-like cells during sleep. This process protects mitochondria, supports memory, and links sleep to metabolic cleanup rather than just rest.

TOPICS DISCUSSED:

• Drosophila as a model: Fruit flies sleep with immobility, reduced responsiveness, and homeostatic rebound; their genetics reveal conserved mechanisms found in humans.
• Circadian vs homeostatic sleep: Circadian timing sets when we sleep; homeostatic drive builds need from prolonged wakefulness independent of time of day.
• Metabolic waste during wake: Neuronal activity oxidizes lipids in mitochondria; these damaged lipids transfer to glial support cells via apolipoproteins.
• Immune cells clear brain trash: Macrophage-like hemocytes dock at the brain during sleep, phagocytose oxidized lipids, and remove them; blocking this docking reduces sleep and impairs memory.
• Peroxisomes & oxidative stress: These organelles handle specific fats and rise with wakefulness; disrupting them increases brain oxidation that can be partially rescued by antioxidants like N-acetylcysteine.
• Sickness sleep differs from normal sleep: Infection-induced sleep redirects energy to immune defense and depletes rather than restores brain energy stores.

ABOUT THE GUEST: Amita Sehgal, PhD is the John Herr Musser Professor of Neuroscience at the University of Pennsylvania, an HHMI Investigator, and director of the Chronobiology and Sleep Institute. She uses Drosophila genetics to uncover basic mechanisms of circadian rhythms and sleep.

RELATED EPISODE:

• M&M 257: Sleep, Mitochondrial Metabolism & Oxidative Stress | Gero Miesenbock

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The science, hype, and unknowns surrounding popular peptides like BPC-157 & TB-500 ("Wolverine stack") for injury recovery & tissue repair.

Nick & Dr. Flynn McGuire discuss the surge in peptide use for injury recovery. They cover peptide basics, the preclinical evidence for BPC-157 and TB-500, mechanisms like angiogenesis and tissue repair, the lack of robust human trials, sourcing risks, regulatory bans, and the gap between anecdotal reports and scientific certainty.

TOPICS DISCUSSED:

• Peptide basics: Short amino acid chains (e.g., insulin, GLP-1 agonists); BPC-157 derived from gastric juice, TB-500 a fragment of thymosin beta-4.
• Rise in popularity: Driven by podcasts, social media, biohacking culture, and post-COVID distrust in institutions; “bro science” often precedes formal research.
• BPC-157 mechanisms: Pleiotropic effects including VEGF upregulation, nitric oxide pathways, angiogenesis, reduced fibrosis, and possible neuromuscular stabilization.
• TB-500 & “stacking”: Often combined with BPC-157 for presumed synergy; marketed as “Wolverine stack” for rapid healing.
• Evidence limitations: Strong rodent data for tendon/muscle repair, but almost no high-quality human trials; one small retrospective study and ongoing phase 2 trial in China.
• Safety and risks: Unknown long-term effects, potential cancer concerns via angiogenesis; no established dosing, potency, or administration route in humans.
• Sourcing & quality issues: Often obtained as “research chemicals” online; variable purity, stability concerns, no reliable regulation or third-party verification for most users.

ABOUT THE GUEST: Flynn Mcguire, MD is a physical medicine and rehabilitation resident at the University of Utah; he conducts clinical work in neurologic recovery and musculoskeletal care and has authored a narrative reviews on peptides for musculoskeletal healing.

RELATED EPISODE:

• M&M 252: Scarring, Fibrosis, Oxidative Stress, and Psilocybin & Aging | Louise Hecker

Reference Paper:

• Paper | Regeneration or Risk? A Narrative Review of BPC-157 for Musculoskeletal Healing

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Biology of obesity resistance and factors influencing weight gain in humans and animals.

TOPICS DISCUSSED:

• Historical views on obesity: In some cultures, like northern Africa or Stone Age societies, high body fat signaled status or attractiveness due to food scarcity, unlike today’s focus on leanness amid calorie abundance.
• Energy balance components: Metabolizable energy (95% absorption on average, but varying 1-11%) and unabsorbed nutrients excreted as waste significantly influence weight.
• Obesity resistance in animals: Inbred mouse strains show wide variation in weight gain on high-fat diets, often somewhat uncoupled from overeating, suggesting roles for feed efficiency, energy expenditure, or waste rather than intake alone.
• Genetic & twin studies: Monozygotic twins overfed 1,000 extra calories daily vary widely in weight gain (4-13 kg), indicating genetic influences, while mouse litter size affects lifelong obesity propensity via early-life programming.
• Bloodborne factors & hormones: Parabiosis studies led to leptin’s discovery for defending against weight loss, but evolutionary logic suggests systems also prevent excess gain, though modern environments may weaken this.
• Human thinness research: Constitutionally thin people snack more, move less, yet have better cardiometabolic health, but we don’t yet understand why.
• GLP-1 drugs & future directions: These slow gut transit and suppress appetite, but obesity’s root causes remain unclear; emerging thinness studies could inform prevention beyond drugs.

ABOUT THE GUEST: Jens Lund, PhD is a postdoctoral researcher at the University of Copenhagen’s Novo Nordisk Foundation Center for Basic Metabolic Research.

RELATED EPISODE:

• M&M 132 | Obesity Epidemic, Diet, Metabolism, Saturated Fat vs. PUFAs, Energy Expenditure, Weight Gain & Feeding Behavior | John Speakman

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• Good Chemistry: Personalized, science-based health consulting. Work with Dr. Nick Jikomes directly.
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Mitochondria in human evolution, climate adaptation, maternal genetics, aging, and disease.

TOPICS DISCUSSED:

• Endosymbiotic theory: Mitochondria arose from oxidative bacteria engulfed by archaea-like hosts, confirmed by phylogenetic analysis.
• Maternal mtDNA inheritance: Mitochondrial DNA is inherited from the mother, not the father. There are adaptive reasons for this.
• Haplogroups & adaptation: Tropical lineages tightly couple energy production for efficiency; northern ones uncouple to generate heat.
• Heteroplasmy & aging: Mixed mutant and normal mitochondria accumulate in cells, eroding energy in high-demand tissues like brain and heart.
• Bioenergetics in disease: Many common conditions, from Parkinson’s to cancer, stem from mitochondrial-nuclear interactions rather than nuclear genes alone.
• Ketogenic diets: High-fat intake fuels mitochondrial beta-oxidation, which may compensate for brain energy deficits in epilepsy and bipolar disorder.
• Warburg effect: Cancer cells shift to glycolysis to prioritize biosynthetic building blocks over maximal ATP production.
• Modern mismatches: Global travel pairs ancestral mtDNA with mismatched diets and climates, raising risks for metabolic dysfunction.

ABOUT THE GUEST: Douglas Wallace, PhD is a geneticist and evolutionary biologist who has studied mitochondria for over 50 years. He currently directs the Center for Mitochondrial and Epigenomic Medicine at Children’s Hospital of Philadelphia and the University of Pennsylvania.

RELATED EPISODE:

• M&M 260 | Energy Resistance Principle in Life, Healing & Disease | Martin Picard & Nirosha Murugan

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Role of bile acids in cholesterol regulation, digestion & metabolic diseases like diabetes.

TOPICS DISCUSSED:

• Bile acids basics: They enable cholesterol excretion, with about half of bodily cholesterol eliminated this way, and also aid digestion by emulsifying fats to increase enzyme access.
• Bile production & pathway: Synthesized in liver hepatocytes, bile flows via ducts to the gallbladder for storage or directly to the small intestine; post-meal, cholecystokinin triggers gallbladder contraction for fat emulsification.
• Regulation of bile acids: Self-regulated to prevent cytotoxicity, as excess can damage cell membranes; insulin and bile acids themselves influence synthesis and transport, with defects in insulin-resistant states.
• Bile acids in metabolic diseases: Increased synthesis, especially 12-hydroxylated types, occurs in type 2 diabetes and insulin resistance, potentially as an adaptation for better nutrient absorption during perceived scarcity.
• Gallbladder removal & gallstones: Common due to cholesterol supersaturation forming stones; removal eliminates concentration but preserves bile flow, reducing tolerance for high-fat meals.
• Bariatric surgery impacts: Procedures like gastric bypass increase circulating bile acids without major synthesis changes, while more extreme ones boost synthesis due to impaired intestinal sensing.
• Cholesterol homeostasis: Cells tightly regulate membrane cholesterol for fluidity and signaling; most bodily cholesterol is synthesized internally, with LDL receptors key to blood levels.
• Ongoing research: Haeusler’s lab explores manganese’s role in metabolism, bile acids in liver inflammation, and insulin’s effects on lipoproteins.

ABOUT THE GUEST: Rebecca Haeusler, PhD is an associate professor at Columbia University in the departments of medicine and pathology and cell biology, affiliated with the Naomi Berrie Diabetes Center and the Digestive and Liver Diseases Research Center.

RELATED EPISODE:

• M&M 269 | Soybean Oil: Obesity, Fatty Liver Disease, Gut Health, IBS & Colitis | Frances Sladek

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How the body's internal circadian clocks regulate metabolism, energy balance, and health.

TOPICS DISCUSSED:

• Master circadian clock in the brain: Light detection via retina entrains the suprachiasmatic nucleus, which coordinates body-wide rhythms; intrinsic period slightly deviates from 24 hours, allowing seasonal flexibility.
• Peripheral clocks in organs: Nearly all cells have autonomous clocks; liver and fat clocks rapidly adjust to feeding time, while brain clock aligns more tightly to light.
• Clock mutations and metabolism: Disrupting core clock genes (e.g., CLOCK, BMAL1) causes obesity, liver fat accumulation, and impaired insulin secretion without hyperinsulinemia.
• Timing of food intake: Eating the same high-fat calories during rest phase causes more weight gain than during active phase due to differences in energy dissipation.
• Modern disruptions (jet lag, shift work, blue light): Create desynchrony between brain and peripheral clocks, contributing to metabolic issues; late-night eating impairs glucose handling.
• Critical illness & feeding: Tube feeding at night (opposite natural cycle) induces rapid insulin resistance, highlighting mismatch costs.
• Hormone rhythms: Testosterone, glucocorticoids, and others peak at specific times; misalignment affects stress, reproduction, and metabolism.
• Weight loss drugs & maintenance: GLP-1 drugs reduce intake effectively, but regain involves neuroendocrine adaptations tied to brain clock pathways.

ABOUT THE GUEST: Joseph Bass, MD, PhD is Chief of Endocrinology, Metabolism and Molecular Medicine at Northwestern University Feinberg School of Medicine, Director of the Center for Diabetes and Metabolism, and a leading researcher who pioneered the link between circadian clock genes and metabolic disorders including obesity and diabetes.

RELATED EPISODE:

• M&M 237 | Circadian Biology: Genetics, Behavior, Metabolism, Light, Oxygen & Melatonin | Joseph Takahashi

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