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Three macronutrient-based rules govern carbohydrate intake: avoid processed carbs, prioritize whole fruits and vegetables, and focus on protein and fat. Insulin resistance is the foundation of type 2 diabetes, which can be reversed through dietary changes rather than medication. A study showed that 11 women with diagnosed type 2 diabetes reversed their condition in 90 days through a dietary intervention aimed at lowering insulin without medication. To reduce insulin levels, fasting is the most effective method, as it allows insulin to drop quickly. When eating, focus on fats and proteins to keep insulin low. The conventional dietary paradigm, which emphasizes carbohydrates, is flawed; humans do not need essential carbohydrates. Instead, prioritize nutrient-dense animal proteins and healthy fats. Insulin resistance develops when fat cells become hypertrophic, leading to the release of free fatty acids and pro-inflammatory molecules that disrupt insulin signaling. To combat this, a low-insulin approach—controlling carbohydrates and prioritizing protein and fat—is recommended. Meal timing is also crucial; eating earlier in the day is more beneficial for metabolic health.

The episode brings together three leading voices in the fasting conversation—Alan Goldhamer, Valter Longo, and Michael Greger—to explore optimal longevity protocols. The discussion centers on differentiating fasting styles: water-only fasting, time-restricted eating, intermittent fasting, and the fasting-mimicking diet (FMD). The guests emphasize that timing is crucial, with early time-restricted feeding (eating within a 12–hour window) generally safer and more effective than longer fasts or skipping meals inconsistently. They describe TrueNorth’s medically supervised water-only fasting as a rigorous, personalized process that ranges from five to forty days, followed by careful recovery, with ongoing monitoring of blood work and electrolytes to ensure safety. In contrast, fasting-mimicking diets offer a less intense, home-based alternative that can yield similar metabolic signals without complete abstinence from food, making it more broadly accessible. The conversation acknowledges that while intermittent fasting patterns can aid weight loss and metabolic health, they do not always translate into the disease-reversing benefits seen with prolonged water-only fasting, particularly for conditions like hypertension and insulin resistance. Longo’s program uses plant-based, low-calorie cycles to induce a fasting-like state, while the panel notes that visceral fat and insulin sensitivity are key levers in chronic disease risk. The panel delves into why visceral fat mobilization during fasting matters more for health than overall weight loss, highlighting how fasting can reduce inflammatory markers and rewire metabolic pathways. They also touch on safety considerations for patients on medications, the importance of a team approach (doctor, dietitian, molecular strategist), and the reality that not everyone is a suitable inpatient candidate. Throughout, the participants stress a practical, evidence-informed path: 12 hours of daily fasting as a safe baseline, occasional extended fasting under supervision, and periodic fasting-mimicking cycles to balance feasibility and efficacy. The discussion rounds out with personal practice, safety caveats, and a hopeful view of fasting as a tool to repair underlying causes of disease rather than merely manage symptoms. ” topics - Fasting protocols for longevity and disease reversal - Water-only fasting vs. fasting-mimicking diet - Time-restricted eating and circadian biology - Visceral fat, inflammation, and metabolic health - Safety, monitoring, and medical supervision in fasting - Dietary patterns and lifestyle factors for aging well otherTopics - Public uptake of fasting in mainstream medicine - Role of medications during fasting transitions - The Daily Dozen and plant-based nutrition philosophy - The potential future of fasting-related pharmacology booksMentioned How Not to Diet; Can Fasting Save Your Life?

Welcome to the Huberman Lab Podcast. I'm Andrew Huberman, a Professor of Neurobiology and Ophthalmology at Stanford. Today, we discuss fasting and its impact on health and wellbeing, including physical and mental aspects. Intermittent fasting, or time-restricted feeding, involves eating during specific periods each day. Most people unknowingly practice some form of intermittent fasting by not eating during sleep. We will explore how different fasting schedules affect weight loss, fat loss, muscle maintenance, organ health, inflammation, cognition, mood, and lifespan. A recent study published in Cell Metabolism found that higher resting blood glucose levels in humans correlate with increased mortality as people age. This contrasts with findings in mice, where lower blood glucose is associated with mortality. This highlights the importance of distinguishing between studies conducted in humans and those in animals. I aim to provide accessible information about science and health tools. Today, I will discuss mechanisms and practical tools for implementing fasting without strict adherence to feeding schedules. For instance, there are ways to mitigate negative effects of occasional deviations from a strict eating window. One key finding is that fasting can improve liver health and reduce inflammation. When we eat, blood glucose and insulin levels rise, while fasting lowers them. The timing of meals is crucial; eating during active phases of the day is beneficial, while late-night eating can be detrimental. Research indicates that restricting food intake to specific windows can enhance liver health and metabolic function. For example, studies show that mice on a time-restricted feeding schedule maintain or lose weight, while those with constant access to food become obese and unhealthy. The ideal feeding window is generally around eight hours, but individual preferences and lifestyles matter. It's essential to avoid food for at least one hour after waking and for two to three hours before bedtime. This allows for optimal metabolic health and supports the body's natural circadian rhythms. Recent literature suggests that time-restricted feeding can lead to improved insulin sensitivity and fat loss. However, shorter feeding windows may lead to overeating. The eight-hour window is often recommended for balancing health benefits and social schedules. For those focused on muscle maintenance, consuming protein early in the day may enhance muscle growth due to the timing of protein synthesis. Transitioning to a new feeding schedule should be gradual, allowing the body to adjust. In summary, the ideal intermittent fasting schedule involves an eight-hour feeding window, avoiding food after waking for at least one hour and before bed for two to three hours. Regularity in meal timing is crucial for maximizing health benefits. Individual variations exist, and some may require different approaches based on their lifestyle and health goals. For further exploration, I recommend resources like My Circadian Clock and the Zero app to help track feeding windows. Remember, the relationship between when you eat and your overall health is significant. Thank you for your interest in science and health.

Time-restricted feeding allows for a low insulin state, promoting metabolic flexibility by alternating between glucose and fat burning. This approach focuses on limiting the eating window rather than calorie restriction, leading to improved insulin sensitivity and better metabolic parameters. A study showed that participants with a six-hour feeding window had better glucose and insulin levels than those with a twelve-hour window, highlighting the benefits of narrowing the eating period. Fasting glucose levels are categorized as normal (below 100), pre-diabetic (100-125), and diabetic (126+). However, optimal fasting glucose may be better between 70-85 for health outcomes. Post-meal glucose should ideally remain under 120, with spikes ideally limited to 30 points. Continuous glucose monitoring can help individuals understand their responses to food and adjust their diets accordingly. Women’s dietary needs fluctuate throughout their menstrual cycle, suggesting that macronutrient composition should vary. A ketogenic diet can be beneficial but should be approached carefully to avoid hormonal disruptions. Intermittent fasting, particularly a 14-hour overnight fast, is recommended for women to maintain hormonal balance. The protocol emphasizes detoxification, proper nutrient intake, and gradual reintroduction of carbohydrates to support metabolic health and weight management.

Dr. Jason Fung, a pioneer of intermittent fasting, argues that the traditional calories in, calories out model is ineffective for weight loss. He emphasizes that obesity is not solely an individual issue but is influenced by hormonal responses and genetics, with about 70% of obesity risk attributed to genetics. Fung explains that weight gain is primarily driven by hormones, particularly insulin, which signals the body to store energy. He critiques the common belief that exercise significantly aids weight loss, noting that it has a minimal impact compared to dietary choices. Fung advocates for intermittent fasting as a method to lower insulin levels, allowing the body to access stored fat for energy. He highlights that the types of food consumed matter more than calorie counting, as different foods elicit varying hormonal responses. For instance, refined carbohydrates spike insulin, leading to increased hunger and subsequent overeating, while whole foods like eggs do not trigger the same response, promoting satiety. He also discusses the societal shift towards frequent eating, which has contributed to rising obesity rates. Fung asserts that fasting is a natural and effective way to regulate hunger and improve metabolic health. He notes that many people are resistant to changing their views on obesity and weight loss due to entrenched beliefs in the calories model. Fung's work aims to shift the conversation towards understanding the hormonal mechanisms behind weight gain and to promote dietary changes that can reverse conditions like type 2 diabetes. He believes that by addressing these deeper issues, individuals can achieve better health outcomes without relying on medications or restrictive diets.

High fasting insulin levels hinder weight loss despite calorie restriction and exercise. Intermittent fasting aligns with our ancestral health, promoting metabolic flexibility. Historically, food scarcity necessitated periods without eating, contrasting with today's constant food availability. Frequent eating and poor food choices contribute to metabolic diseases, with 88.2% of Americans being metabolically inflexible. The overconsumption of processed carbohydrates and unhealthy fats, like seed oils, exacerbates this issue. Cynthia Thurlow emphasizes the importance of both what and when we eat, advocating for reduced meal frequency and prioritizing protein intake. She highlights the hormonal dysregulation affecting weight loss resistance, asserting that simply counting calories is overly simplistic. Intermittent fasting enhances metabolic flexibility, allowing the body to utilize stored fat for energy, leading to improved health markers and cognitive function. Thurlow suggests starting with a protein-focused meal to break a fast and advises against snacking. She discusses the importance of aligning eating patterns with circadian rhythms, recommending earlier meals for better insulin sensitivity. The recent New England Journal of Medicine study on time-restricted feeding has sparked debate, but Thurlow argues that its flawed methodology does not undermine the benefits of intermittent fasting. Ultimately, she encourages flexibility in fasting practices and emphasizes the need for individualized approaches to nutrition and meal timing.

In a discussion about dietary approaches, Ben Bikman emphasizes the relationship between insulin, fat storage, and weight management. He notes that while some individuals on strict carnivore or low-carb diets may experience weight gain, this is often due to pre-existing insulin resistance or high insulin levels rather than the diet itself. Bikman explains that high insulin promotes fat storage, regardless of calorie intake, and that addressing insulin levels is crucial for effective weight loss. He highlights the importance of understanding fasting insulin levels, suggesting that a level below 6 micro units per milliliter indicates good insulin sensitivity. He argues that fasting insulin is a more critical marker of metabolic health than glucose levels, which can remain normal even as insulin resistance develops. Bikman advocates for a dietary approach that prioritizes controlling carbohydrates, emphasizing protein intake, and not fearing dietary fats, as these strategies can help lower insulin levels and improve metabolic health. Bikman also discusses the role of muscle mass in metabolic health, noting that increased muscle can enhance insulin sensitivity and aid in glucose management. He warns against calorie counting as a primary strategy for weight loss, arguing that it often leads to failure due to the body's complex energy regulation mechanisms. Instead, he suggests that individuals should focus on reducing insulin levels first, which can naturally lead to weight loss without the constant struggle of calorie restriction. He acknowledges the challenges of dietary changes, particularly for those with deep-seated habits or emotional connections to food. Bikman encourages individuals to find a balance that works for them, emphasizing the importance of whole foods over processed options. He also touches on the societal issues surrounding obesity, suggesting that a lack of community and connection contributes to poor dietary choices and health outcomes. In conclusion, Bikman advocates for a holistic approach to health that includes dietary adjustments, physical activity, and fostering social connections, all while maintaining a focus on insulin management as a key to achieving and sustaining metabolic health.

In this episode of the Huberman Lab podcast, Andrew Huberman speaks with Dr. Sachin Panda, a leading researcher in circadian biology and intermittent fasting. Dr. Panda's work has significantly advanced our understanding of circadian rhythms, which influence various biological processes, including mood, sleep, and metabolism. He discusses how our daily behaviors, such as eating, light exposure, and social interactions, impact our health. Dr. Panda emphasizes the benefits of time-restricted feeding (TRF), a form of intermittent fasting where eating is confined to specific hours of the day. He explains that restricting food intake to an 8 to 12-hour window can improve metabolic health, liver function, and cognitive performance. The conversation delves into various studies, including clinical trials involving diverse populations, such as healthy individuals and those with diabetes, demonstrating the positive effects of TRF on health markers. The discussion also covers the definitions of fasting and time-restricted feeding, highlighting that while all humans experience some form of fasting during sleep, TRF involves a more structured approach to eating patterns. Dr. Panda clarifies that intermittent fasting encompasses various methods, including alternate-day fasting and the 5:2 diet, but TRF focuses on the timing of food intake without necessarily reducing caloric intake. Dr. Panda notes the importance of consistency in feeding times, as our bodies have internal clocks that anticipate food intake. He explains that irregular eating patterns can disrupt these circadian rhythms, leading to negative health outcomes. The conversation touches on the physiological mechanisms behind these effects, including how the liver and other organs respond to feeding times. The podcast also addresses the implications of shift work on health, as many individuals experience disrupted circadian rhythms due to irregular schedules. Dr. Panda shares insights from a study involving firefighters, who often work 24-hour shifts, and how implementing a TRF approach improved their metabolic health without requiring significant lifestyle changes. In addition to discussing the benefits of TRF, Dr. Panda highlights the importance of nutrition quality and the potential risks of extreme dietary restrictions. He cautions against overly restrictive eating patterns that could lead to nutrient deficiencies or negative health effects, particularly for active individuals. The episode concludes with a discussion on the broader implications of circadian biology for public health, emphasizing the need for awareness of how our daily habits affect our well-being. Dr. Panda encourages listeners to consider their eating schedules and the timing of their meals as a means to enhance overall health and longevity. Listeners are directed to Dr. Panda's books, including "The Circadian Code" and "The Circadian Diabetes Code," for further insights into his research. The episode serves as a comprehensive overview of the science behind circadian rhythms and their practical applications for improving health through mindful eating practices.

Visceral fat is not merely about looks; it’s a gateway to inflammation, insulin resistance, and heart disease, and a growing medical approach centers on fasting as the fastest route to shed it. A world-leading cardiologist with decades of experience explains how repeated carb intake keeps insulin high, promotes visceral fat, and fuels artery disease. He emphasizes that after about 12 hours of fasting, the body begins pulling stored fat from the belly first, a process he uses to reverse metabolic derangements. The conversation then shifts to how modern living disrupts fasting physiology, contributing to a cascade of inflammatory signals, fatty liver, and a skewed lipid profile that can culminate in heart attacks even in younger patients. He maps a chain from gut health to heart disease, highlighting how insulin-driven visceral fat and ectopic fat around organs inflame blood vessels. A key diagnostic thread is insulin testing, because many patients exhibit high insulin with normal glucose, a sign of insulin resistance that predates diabetes and accelerates cardiovascular risk. Fasting emerges as a powerful instrument: from 12-hour fasts to 18:6 schedules, with more aggressive regimens for those with diabetes or obesity, such as weekly 48-hour fasts or occasional three-day water fasts, followed by one meal a day. He also notes that ketosis and autophagy make cells more efficient, produce ketones as fuel, and can boost brain function and growth hormone, while the body cycles between fed and fasted states to preserve muscle when properly managed. The discussion then turns to the gut as the main driver of cardiovascular inflammation. A disrupted microbiome, leaky gut, and mold exposure are described as contributors to fatty liver and coronary plaque, with the liver and gut coordinates measured by inflammatory markers and coronary calcium scoring. Rebalancing the microbiome—through high-fiber diets, fermented foods, and specific prebiotic supplements—can dampen systemic inflammation and slow plaque progression. He advocates vitamin D3 and K2 to optimize calcium handling, cautions against routine calcium supplements, and endorses omega-3s and nattokinase to modulate clotting. Beyond diet, he explains vagus nerve hacks—breathing exercises, cold exposure, humming, and even eye movements—that enhance parasympathetic activity, improve heart rate variability, and support gut-brain communication. He stresses that sleep and stress management are essential for gut health and heart protection.

Dhru Purohit hosts a discussion with Rangan Chatterjee, Ben Bikman, and Shawn Stevenson on sustainable weight loss and health improvement strategies that move beyond traditional calorie-centric paradigms. Rangan emphasizes that sustainable weight loss can be achieved without drastic dietary changes by focusing on factors such as hunger, eating environment, and timing. He critiques the long-standing belief that weight loss is solely about caloric deficit, arguing that this approach often leads to yo-yo dieting due to constant hunger and deprivation. He introduces the importance of insulin in weight management, explaining that fat cells cannot grow without elevated insulin levels and cannot shrink unless insulin is low. Rangan advocates for prioritizing the endocrine component, particularly insulin management, over calorie counting, which can be tedious and frustrating. He explains that insulin is produced by the pancreas and plays a crucial role in lowering blood glucose levels after carbohydrate consumption. However, chronic high insulin levels can lead to insulin resistance, a condition affecting a significant portion of the population, particularly in Western countries. The conversation also touches on the relationship between insulin resistance and various health issues, including erectile dysfunction, hypertension, and neurological disorders like migraines and Alzheimer's disease. Rangan highlights that insulin resistance can stem from dietary choices and stress, emphasizing the need for a holistic approach to health that includes emotional well-being and stress management. The discussion further explores the role of the microbiome in metabolism and weight regulation, noting that gut diversity is linked to obesity. Rangan shares insights from studies showing that specific gut bacteria can influence calorie absorption and body composition. He stresses the importance of a diverse diet rich in whole foods to support gut health. The hosts also discuss the psychological aspects of eating, emphasizing that emotional factors often drive unhealthy eating behaviors. Rangan introduces the "three F's" exercise to help individuals understand their feelings around food and find non-food alternatives to address emotional needs. Finally, the conversation underscores the interconnectedness of food, health, and relationships, highlighting how nutritional deficiencies can impact emotional stability and interpersonal dynamics. The hosts call for a shift in focus from mere calorie counting to a more nuanced understanding of health that incorporates emotional, psychological, and physiological factors.