The Metabolic Classroom with Dr. Ben Bikman

• Cortisol & Insulin Resistance: How Cortisol Drives Fat Gain & Carb Cravings

  This week, Dr. Bikman dives deep into the metabolic role of cortisol, the body’s primary glucocorticoid. He explains that while cortisol is essential for survival—mobilizing energy during fasting or stress—chronically elevated levels can wreak metabolic havoc.Cortisol is produced by the adrenal cortex under direction from the hypothalamic-pituitary-adrenal (HPA) axis. Its main role is to ensure energy availability, stimulating glycogen breakdown, muscle catabolism, and fat breakdown in specific depots. However, long-term cortisol elevation, such as in Cushing’s disease, leads to fat redistribution, muscle loss, insulin resistance, and increased risk of type 2 diabetes.Cortisol’s metabolic effects are driven by its action on glucocorticoid receptors inside cells, activating genes like PEPCK and glucose-6-phosphatase that stimulate gluconeogenesis and increase blood sugar. It also indirectly causes insulin resistance by increasing ceramide accumulation, which interferes with insulin signaling in cells like muscle and fat. This, combined with glucose overproduction and muscle loss (the major glucose sink), creates a perfect metabolic storm: high blood sugar, high insulin, and reduced glucose uptake.The hormone also affects fat storage patterns. Cortisol enhances fat accumulation in visceral (abdominal) fat while stimulating fat loss in subcutaneous regions like the limbs. It increases fat uptake by upregulating lipoprotein lipase and blocks fat breakdown by suppressing hormone-sensitive lipase, especially in the abdominal region. Yet cortisol alone isn’t enough to cause fat gain—insulin is still required. Ben illustrates this by showing how individuals with untreated type 1 diabetes have high cortisol and high appetite but still lose fat without insulin.Lastly, cortisol influences the brain’s hunger and reward systems, increasing carbohydrate cravings through neuropeptide Y and dopamine signaling. Chronic stress or medical conditions that elevate cortisol can drive overeating and central obesity. In short, while cortisol is necessary, its chronic elevation leads to insulin resistance, fat redistribution, and loss of metabolic control.Show Notes/References:For complete show notes and references, we invite you to become a Ben Bikman Insider subscriber. As a subscriber, you’ll enjoy real-time, livestream Metabolic Classroom access which includes live Q&A after the lecture with Ben, ad-free podcast episodes, show notes and references, Ben’s Research Reviews Podcast, and a searchable archive that includes all Metabolic Classroom episodes and Research Reviews. Learn more: https://www.benbikman.com#Cortisol #InsulinResistance #ChronicStress #GlucoseControl #MetabolicHealth #CushingsDisease #HormonalBalance #FatStorage #Ceramides #DrBenBikman #VisceralFat #FatLoss #SubcutaneousFat #BloodSugar #AppetiteRegulation #Type2Diabetes #Mitochondria #HPAaxis #CortisolAndCravings #FatDistribution 📢 Learn more about becoming an Insider on Ben’s website: https://www.benbikman.com Hosted on Acast. See acast.com/privacy for more information.

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• “Fast” vs. “Slow” Insulin Resistance: The Two Paths Explained

  In this lecture, Dr. Bikman presents a framework for understanding the two primary patterns of insulin resistance onset—what he terms “fast” and “slow” insulin resistance.“Fast” insulin resistance happens quickly and can often be reversed just as rapidly. It’s typically triggered by three major factors: elevated insulin (from frequent carb consumption), stress hormones like cortisol and epinephrine, and inflammation (from infection, injury, or autoimmune activity). These triggers lead to the cellular accumulation of ceramides, which interfere with insulin signaling at the molecular level. The good news, he emphasizes, is that when these triggers are removed, the insulin resistance can often resolve quickly.“Slow” insulin resistance, on the other hand, develops gradually and is more difficult to reverse. It begins in the fat cell, where prolonged exposure to insulin and excess calories causes hypertrophy—the fat cells get larger. As they grow, they become insulin resistant as a form of self-preservation, but this leads to a damaging cascade: elevated free fatty acids, chronic low-grade inflammation, and disruption of glucose control. Dr. Bikman describes how hypertrophic fat cells become hypoxic, triggering inflammation and impairing surrounding tissues.Unlike the fast form, slow insulin resistance is rooted in long-term lifestyle habits and takes time to correct. The standard advice to “just cut calories” fails to address the core issue—chronically high insulin. Instead, Ben recommends that people first focus on lowering insulin through carbohydrate restriction, which naturally curbs hunger, boosts energy expenditure, and allows fat cells to shrink in a sustainable way.He concludes that understanding whether your insulin resistance is fast or slow in origin can help shape more effective interventions. With better insight into the mechanisms—from ceramides to fat cell hypertrophy—comes better, more targeted strategies to improve metabolic health.Show Notes/References:For complete show notes and references, we invite you to become a Ben Bikman Insider subscriber. As a subscriber, you’ll enjoy real-time, livestream Metabolic Classroom access which includes live Q&A after the lecture with Ben, ad-free podcast episodes, show notes and references, Ben’s Research Reviews Podcast, and a searchable archive that includes all Metabolic Classroom episodes and Research Reviews. Learn more: https://www.benbikman.com Hosted on Acast. See acast.com/privacy for more information.

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  29:54
• Cold Therapy & Metabolism, Metabolic Health Benefits of Ice Baths and Shivering

  During this week’s Metabolic Classroom lecture, Ben explores the metabolic power of cold therapy, explaining how brief, controlled exposure to cold can significantly enhance metabolic function.He starts with a deep dive into brown adipose tissue (BAT), which is rich in mitochondria and burns calories to generate heat. Cold exposure activates BAT through norepinephrine, leading to mitochondrial uncoupling and energy expenditure without producing ATP. Interestingly, even white fat can be transformed into metabolically active “beige” fat, increasing thermogenesis.Dr. Bikman then moves into how shivering muscle activity contributes to thermogenesis. Unlike BAT, muscle contraction generates heat while performing work. Shivering triggers glucose uptake, improves insulin sensitivity, and releases irisin, a hormone that stimulates thermogenic activity in fat tissue. He also discusses AMPK activation, which plays a key role in facilitating this glucose-burning process.The lecture then highlights a series of hormones influenced by cold, including FGF21 and adiponectin, which boost fat oxidation, enhance insulin sensitivity, and promote mitochondrial biogenesis. Ben reflects on the broader role of the autonomic nervous system, emphasizing how cold therapy improves both sympathetic and parasympathetic function, promoting nervous system flexibility and resilience.Dr. Bikman wraps up by comparing cold exposure methods—from face immersion and cold showers to cryotherapy and full-body ice baths. He strongly endorses full-body cold water immersion as the most effective strategy, especially when shivering occurs post-immersion. His personal recommendation is the Morozko Forge ice bath (he has no vested interest in this company), citing its sustained metabolic impact and practical benefit. He closes by urging viewers to consider cold therapy as a scientifically grounded tool to support overall metabolic health.Show Notes/References:For complete show notes and references, we invite you to become a Ben Bikman Insider subscriber. As a subscriber, you’ll enjoy real-time, livestream Metabolic Classroom access which includes live Q&A after the lecture with Ben, ad-free podcast episodes, show notes and references, Ben’s Research Reviews Podcast, and a searchable archive that includes all Metabolic Classroom episodes and Research Reviews. Learn more: https://www.benbikman.com#ColdTherapy #IceBath #BrownFat #MetabolicHealth #InsulinResistance #Mitochondria #ShiveringThermogenesis #AMPK #Irisin #FGF21 #Adiponectin #FatLoss #GlucoseControl #HealthOptimization #AutonomicNervousSystem #BeigeFat #WeightLossTips #Hormones #Biohacking #BenBikman #drbenbikman 📢 Learn more about becoming an Insider on Ben’s website: https://www.benbikman.comBen’s favorite yerba maté and fiber supplement: https://ufeelgreat.com/usa/en/c/1BA884Ben’s favorite meal-replacement shake: https://gethlth.com (discount: BEN10)Ben’s favorite electrolytes (and more): https://redmond.life (discount: BEN15)Ben’s favorite allulose source: https://rxsugar.com (discount: BEN20)Ben’s favorite health check-up for women: https://choosejoi.co/drben15 (discount: DRBEN15)Ben’s favorite health check-up for men: https://blokes.co/drben15 (discount: DRBEN15)Ben’s favorite exogenous ketone: https://www.americanketone.com (discount: BEN10)Ben’s favorite dress shirts and pants: https://toughapparel.com/?ref=40 (use BEN10 for 10% off)Other products Ben likes: https://www.amazon.com/shop/benbikmanph Hosted on Acast. See acast.com/privacy for more information.

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  31:48
• Seed Oils and Insulin Resistance: What the Science Really Says

  During this week’s Metabolic Classroom lecture, Dr. Ben Bikman explores the connection between seed oils—specifically linoleic acid—and insulin resistance, a growing area of interest and controversy in the metabolic health world.Ben begins by detailing the historical rise of seed oils like soybean, corn, sunflower, and canola oil in the human diet. Once used for industrial purposes, they have now become the most common source of dietary fat, with soybean oil consumption increasing from zero to over 20 pounds per person per year in the U.S.. This rise coincides with a global increase in insulin resistance, prompting the question: Are seed oils to blame?Dr. Bikman focuses on linoleic acid, the primary omega-6 polyunsaturated fat in seed oils, and differentiates between the fat itself and its oxidation products, such as 4-HNE and 13-HODE. He cites cell culture studies showing that unoxidized linoleic acid doesn’t impair insulin signaling, but its peroxidation products dramatically compromise insulin receptor function and glucose transport. Animal studies further support this by showing that diets high in linoleic acid lead to insulin resistance, obesity, and elevated inflammatory markers, while animals consuming fats like coconut oil fare much better.However, when it comes to human studies, the picture becomes more complex. Some clinical trials suggest that diets high in polyunsaturated fats can improve insulin sensitivity—but these diets are almost always high in carbohydrates, and rarely test seed oils in a low-carb context. Dr. Bikman proposes a unifying theory: saturated fats may be more problematic when consumed alongside carbohydrates, because insulin shunts them into ceramide biosynthesis, a direct driver of insulin resistance. Linoleic acid, on the other hand, becomes dangerous when it undergoes peroxidation, especially in high oxidative stress environments or when used in cooking.Ben concludes that context matters. Linoleic acid is present in all natural fats and can’t be avoided entirely—but its overconsumption through refined seed oils, particularly in fried foods or highly processed products, is likely harmful. He encourages consumption of natural fats from animals and fruits (like coconuts and olives), rather than industrial seed oils, especially for those concerned about metabolic health and insulin resistance.Show Notes/References:For complete show notes and references, we invite you to become a Ben Bikman Insider subscriber. As a subscriber, you’ll enjoy real-time, livestream Metabolic Classroom access which includes live Q&A after the lecture with Ben, ad-free podcast episodes, show notes and references, Ben’s Research Reviews Podcast, and a searchable archive that includes all Metabolic Classroom episodes and Research Reviews. Learn more: https://www.benbikman.comBen’s favorite yerba maté and fiber supplement: https://ufeelgreat.com/usa/en/c/1BA884Ben’s favorite meal-replacement shake: https://gethlth.com (discount: BEN10)Ben’s favorite electrolytes (and more): https://redmond.life (discount: BEN15)Ben’s favorite allulose source: https://rxsugar.com (discount: BEN20)Ben’s favorite health check-up for women: https://choosejoi.co/drben15 (discount: DRBEN15)Ben’s favorite health check-up for men: https://blokes.co/drben15 (discount: DRBEN15)Ben’s favorite exogenous ketone: https://www.americanketone.com (discount: BEN10)Ben’s favorite dress shirts and pants: https://toughapparel.com/?ref=40 (use BEN10 for 10% off)Other products Ben likes: https://www.amazon.com/shop/benbikmanphd Hosted on Acast. See acast.com/privacy for more information.

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  29:07
• Fat Metabolism Deep Dive: Saturated, Mono, and Poly Fats Explained

  (📢 NOTE: We apologize for the sound glitch starting at 2 minutes. Dr. Bikman’s lectures are recorded LIVE, and our production team didn’t want to interrupt him. 🙂 )Dr. Ben Bikman’s Metabolic Classroom lecture this week explores fat metabolism and the differences between saturated, monounsaturated, and polyunsaturated fats. He begins by explaining that fat is more than just stored energy—it serves as fuel, structure, and biochemical signaling molecules. He categorizes fats based on saturation state, detailing how each type influences metabolism and health outcomes. Saturated fats (found in butter, coconut oil, and animal fat) are stable and non-reactive, making them efficient energy sources. Monounsaturated fats (found in olive oil and avocados) are slightly more flexible and commonly stored in fat cells. Polyunsaturated fats (PUFAs), such as omega-3 and omega-6 fats, play an important role in cell signaling but are highly prone to peroxidation, leading to inflammation and oxidative stress—especially when consumed from refined seed oils like soybean and corn oil.Dr. Bikman then discusses how the body metabolizes and stores different fats. Long-chain saturated fats can be stored or burned for energy, while medium- and short-chain saturated fats (found in coconut oil and dairy) bypass traditional fat storage pathways and are rapidly burned for energy, often increasing ketone production. Monounsaturated fats (like oleic acid from olive oil) are the most abundant in human fat cells, showing the body's preference for this fat type. However, PUFAs, particularly linoleic acid from seed oils, are problematic because they are prone to peroxidation, contributing to inflammation and metabolic dysfunction.Ben highlights research showing that high-carbohydrate diets increase the body's internal production of saturated fat, meaning even if someone avoids saturated fats in their diet, their liver will still create them from excess carbohydrates. He also explains that PUFAs, despite their risks, can be burned as energy, but their instability can cause oxidative damage. The key takeaway is that fat metabolism is dynamic, and insulin levels dictate whether fats are burned or stored. He concludes that natural, whole-food fats—especially saturated and monounsaturated fats—are the best choices for metabolic health, while high-PUFA seed oils should be avoided.Show Notes/References:For complete show notes and references, we invite you to become a Ben Bikman Insider subscriber. As a subscriber, you’ll enjoy real-time, livestream Metabolic Classroom access which includes live Q&A after the lecture with Ben, ad-free podcast episodes, show notes and references, Ben’s Research Reviews Podcast, and a searchable archive that includes all Metabolic Classroom episodes and Research Reviews. Learn more: https://www.benbikman.comBen’s favorite yerba maté and fiber supplement: https://ufeelgreat.com/usa/en/c/1BA884Ben’s favorite meal-replacement shake: https://gethlth.com (discount: BEN10)Ben’s favorite electrolytes (and more): https://redmond.life (discount: BEN15)Ben’s favorite allulose source: https://rxsugar.com (discount: BEN20)Ben’s favorite health check-up for women: https://choosejoi.co/drben15 (discount: DRBEN15)Ben’s favorite health check-up for men: https://blokes.co/drben15 (discount: DRBEN15)Ben’s favorite exogenous ketone: https://www.americanketone.com (discount: BEN10)Ben’s favorite dress shirts and pants: https://toughapparel.com/?ref=40 (use BEN10 for 10% off)Other products Ben likes: https://www.amazon.com/shop/benbikmanphd Hosted on Acast. See acast.com/privacy for more information.

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  36:25

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