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

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Ben’s favorite yerba maté and fiber supplement: https://ufeelgreat.com/usa/en/c/1BA884

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Ben’s favorite allulose source: https://rxsugar.com (discount: BEN20)

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Ben’s favorite exogenous ketone: https://www.americanketone.com (discount: BEN10)

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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.com

Ben’s favorite yerba maté and fiber supplement: https://ufeelgreat.com/usa/en/c/1BA884

Ben’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

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(📢 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.com

Ben’s favorite yerba maté and fiber supplement: https://ufeelgreat.com/usa/en/c/1BA884

Ben’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.