Fructose Metabolism in Obesity, Dementia, Evolution | Richard Johnson | Episode 295

Send us Fan MailFructose survival hypothesis: how fructose metabolism in the liver triggers ATP depletion, uric acid production, oxidative stress, lipogenesis & leptin resistance.TOPICS DISCUSSED:Glucose vs Fructose Metabolism: Fructose is rapidly metabolized in the liver by fructokinase without feedback, causing ATP depletion and uric acid production, unlike glucose metabolism.Liver Effects: Fructose induces uric acid production, NADPH oxidase activation, mitochondrial oxidative stress, and de novo lipogenesis even under caloric restriction.Fructose Survival Hypothesis: Fructose signaling promotes fat storage, leptin resistance, foraging behavior, and metabolic syndrome as adaptations for hibernation or starvation, including metabolic water production.Brain Impacts: Endogenous fructose production from glucose (polyol pathway) triggered by high glucose, salt, or stress leads to insulin resistance, mitochondrial damage, and neuroinflammation in Alzheimer’s-vulnerable regions.Evolutionary Context: Human uricase mutation ~12 million years ago enhanced fructose effects for fat storage during seasonal starvation but increases vulnerability today.Modern Triggers: Added sugars, high fructose corn syrup, salt-sugar combinations, and omega-6 fats synergize with fructose to amplify inflammation, appetite, and disease risk.Alzheimer’s Link: Fructose-driven brain changes mirror Alzheimer’s pathology, with high brain fructose in patients and potential for fructokinase inhibitors as therapy.ABOUT THE GUEST: Richard Johnson MD, is a professor of medicine who has conducted clinical practice and NIH-funded research on sugar metabolism since the late 1990s. His work focuses on the role of fructose in metabolic syndrome, obesity, and related diseases.RELATED CONTENT:Article | Dietary Fructose & Metabolic Health: An Evolutionary PerspectiveM&M 249: Fructose, Microglia, Anxiety & Brain Development | Justin Perry | 249Support the showSupport my work:Good Chemistry: Personalized, science-based health consulting. Work with Dr. Nick Jikomes directly.Affiliate Partners: Visit this link to see my affiliate partners and get discounts codes for products & services to support health.For all the ways you can support my efforts.