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On March 29, the study 'Association of 8-Hour Time-Restricted Eating with All-Cause and Cardiovascular Mortality' and the AHA headline '8-Hour Time-Restricted Eating Linked to a 91% Higher Risk of Cardiovascular Death' are discussed. The abstract is described as preliminary: 'the long-term health effects of time-restricted eating, including risk of death from any cause or cardiovascular disease, are unknown.' The data come from NHANES 2003–2008 linked to CDC mortality, involving about 20,000 US adults: 11,838 in the 12–16 hour group, 4,148 in the <8 hour group, with 840 CVD deaths. The speaker notes this is observational and 'severely limited' in proving causation, only showing associations. Numbers and interpretation follow. The speaker summarizes: 'per 100 people in a group eating in a window between 12 to 16 hours, we can expect approximately four people to die of cardiovascular disease. If you're eating in a less than 8-hour window, we can expect approximately seven people to die of cardiovascular disease.' The 8-hour group had 31 deaths vs. 423 in the 12–16 hour group before adjustment, yielding a 109% relative risk, later adjusted to 91%.

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?

Dr. Satchin Panda discusses the significance of circadian rhythms and their impact on health, emphasizing that the timing of eating may be as crucial as the food itself. Circadian rhythms govern various bodily functions, including metabolism, immune response, and cellular repair. Each cell has its own 24-hour timetable, influencing when to produce energy, recycle, and rejuvenate. Panda highlights time-restricted eating (TRE) as a practical application of circadian biology, suggesting that eating within a 12-hour window can enhance metabolic health. He explains that different organ systems have their own biological clocks, affecting digestion and nutrient absorption. For instance, saliva production and digestive enzyme activity peak during the day and decrease at night, which can lead to issues like acid reflux if one eats late. He notes that late-night eating can disrupt sleep and lead to metabolic problems, including impaired insulin production and higher blood glucose levels. Studies show that individuals who eat late at night may experience weight gain and other health issues due to these disruptions. Panda emphasizes the importance of aligning eating patterns with circadian rhythms to improve overall health. Panda also discusses the implications of shift work, which affects a significant portion of the population. He points out that shift workers are at higher risk for various health issues, including metabolic disorders and cardiovascular diseases. He advocates for public policy changes to support shift workers and improve their health outcomes. The conversation touches on the importance of sleep, with Panda asserting that quality sleep is foundational for health. He suggests that individuals should aim for consistent sleep schedules, avoid bright light before bedtime, and consider the timing of their meals to enhance sleep quality. Panda shares insights from a study involving firefighters, who adopted a 10-hour eating window. The results indicated that this practice did not hinder their performance and led to improvements in mental health and reductions in inflammation markers. He emphasizes the potential benefits of TRE for various populations, including those in high-stress jobs. The discussion concludes with Panda highlighting the need for further research on circadian rhythms and their applications in public health. He encourages individuals to adopt simple lifestyle changes, such as consistent meal times and exposure to natural light, to enhance their health and well-being.

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 eating (TRE) is based on circadian rhythms, which are daily biological cycles that influence various bodily functions. These rhythms optimize physical, emotional, and intellectual performance by regulating immune responses, detoxification processes, and recovery from injuries. People are naturally programmed to eat during specific times of the day, aligning with their circadian clocks. TRE involves consuming all calorie-containing foods within a consistent time window during waking hours, which can enhance overall health and support weight loss. Intermittent fasting, often used interchangeably with TRE, refers to various eating patterns that include periods of fasting. Research shows that even without calorie reduction, animals on a time-restricted diet can maintain or lose weight, suggesting that the timing of food intake plays a crucial role in metabolism. Studies indicate that eating within an 8-9 hour window can lead to a 20% reduction in calorie intake, even among those who do not consciously restrict calories. The timing of meals affects metabolic processes, including how the body digests and absorbs nutrients. For instance, the gut microbiome adapts to TRE, altering how nutrients are processed and potentially leading to less fat storage. Additionally, fasting periods can enhance fat burning and improve metabolic health markers, such as blood glucose and cholesterol levels. Human studies have shown that individuals who eat within a shorter time frame often experience better blood sugar regulation and improved sleep quality. Consistent meal timing helps synchronize the body's internal clock, which can lead to enhanced energy levels and overall well-being. The optimal eating schedule typically involves waiting 1-2 hours after waking to eat breakfast and finishing meals 2-3 hours before bedtime to allow for proper digestion and preparation for sleep. Light exposure also plays a significant role in regulating circadian rhythms. Natural light in the morning can help reset the body's clock, while avoiding bright light in the evening supports melatonin production, promoting better sleep. Regular physical activity, ideally scheduled for late afternoon or early evening, can further enhance metabolic health and improve insulin sensitivity. Overall, the integration of consistent meal timing, adequate light exposure, and regular exercise can significantly impact health outcomes, making it easier for individuals to manage their weight and improve their metabolic health without the need for strict calorie counting. The new app, On Time Health, aims to help users adopt these habits by providing guidance on aligning their daily routines with their circadian rhythms.

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.

Cynthia Thurlow discusses the benefits of fasting, emphasizing that our bodies are naturally adapted to eat less frequently. She believes that everyone can benefit from a minimum of 12 hours of fasting, which should be the gold standard for health. Many people hesitate to embrace fasting due to limiting beliefs and societal conditioning that promotes constant snacking and eating. This mindset, combined with complex relationships with food, often leads to overthinking and analysis paralysis regarding fasting. Thurlow highlights the importance of energy and cognitive function as key benefits of fasting. She explains that fasting enhances autophagy, a process that helps recycle waste in the body and reduces the risk of chronic diseases. She also notes that many people mistakenly believe that feeling tired or weight gain is a natural part of aging, when in fact, fasting can help combat these issues. Metabolic flexibility is a central theme in Thurlow's discussion. She explains that metabolic flexibility allows the body to efficiently utilize different fuel sources, such as glucose and fatty acids. Signs of poor metabolic flexibility include frequent hunger, weight loss resistance, and fatigue after meals. Thurlow emphasizes the importance of monitoring biomarkers like fasting insulin, triglycerides, and HDL levels to assess metabolic health. Thurlow advocates for a flexible approach to fasting, suggesting that individuals can start with a 16:8 fasting schedule and adjust based on their lifestyle and needs. She stresses that fasting should not be rigid and can be tailored to individual circumstances, including hormonal changes in women. The conversation also touches on the impact of processed foods on health and the importance of cooking and meal preparation. Thurlow argues that the processed food industry has conditioned society to eat more frequently and less healthily, leading to metabolic issues. Thurlow shares her personal health journey, including her experience with autoimmune conditions and how dietary changes, including fasting, have helped her manage her health. She emphasizes the importance of adequate protein intake and strength training for maintaining muscle mass and overall health as one ages. Finally, Thurlow encourages listeners to take small steps toward improving their health, whether through fasting, walking, or seeking social support. She highlights the significance of finding a supportive community and working with knowledgeable practitioners to achieve health goals.

Fasting changes the way your body fuels itself, and when you eat often matters as much as what you eat. Intermittent fasting, or time-restricted feeding, influences weight loss and health parameters, interacting with exercise, hormones, and circadian biology. A cornerstone study by Gardner and colleagues in 2018 found that, over 12 months, there was no significant difference in weight change between healthy low‑fat and healthy low‑carbohydrate diets when calories were matched. The implication is not that diet is irrelevant, but that calories burned exceeding calories ingested remains crucial for weight loss, while other factors shape health and performance. A second pillar comes from animal studies showing that timing of eating shifts physiology. In mice fed a high-fat diet, restricting feeding to an eight-hour window maintained or improved lean mass and reduced disease risk compared with around-the-clock eating. The study anchored the circadian rhythm: about 80 percent of genes cycle daily, and misalignment between timing and the environment can undermine health. Autophagy and other repair processes are amplified during sleep and fasting, while continuous feeding can disrupt them. Thus, aligning eating with the clock supports liver health and metabolic function. Practical guidelines emerge from these findings. A widely supported target is an eight-hour feeding window, with no calories for the first hour after waking and no calories in the two to three hours before bed, to preserve sleep-related fasting. Commonly feasible schedules place the window around 10:00 a.m. to 6:00 p.m. or 12:00 p.m. to 8:00 p.m., allowing social meals while maximizing fasting overnight. For muscle, protein earlier in the day may help hypertrophy, though overall calories and training remain important. If hunger or mood drift challenge adherence, gentle strategies such as a light post‑meal walk or occasional salt can ease transitions; plan a gradual transition over several days.”], topics otherTopics

In this episode of the Ultimate Human podcast, Gary Brecka and Kristen Holmes discuss time-restricted eating and its effects on women's health, particularly concerning the menstrual cycle. They note that strict intermittent fasting can disrupt hormones in women, especially during the luteal phase. Research indicates that a feeding window of about 10 hours may improve sleep and recovery. They emphasize the importance of eating earlier in the day and avoiding food and alcohol before bed, as these factors significantly impact sleep quality. Holmes highlights the need for broader research on women's responses to fasting and encourages women to adopt a wider feeding window for better health outcomes.

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.

Dr. Amy Shaw discusses her passion for circadian biology, emphasizing that our genes operate differently throughout the day, impacting energy, health, and metabolism. She highlights the importance of aligning eating and activity with our natural rhythms, advocating for intermittent fasting and improved light exposure. Shaw shares her personal journey through burnout, which led her to explore the connections between circadian rhythms, gut health, and hormone balance. She suggests that many people eat for 16 hours a day, which can disrupt metabolic health, and encourages starting with a 12-hour fasting window. Shaw warns that women, particularly those of childbearing age, should approach fasting cautiously due to potential hormonal impacts. She stresses the significance of natural light exposure in the morning and the benefits of outdoor workouts. Shaw also critiques the modern food environment, noting how processed foods can hijack our brain's reward systems, leading to unhealthy eating patterns. She advocates for a focus on whole foods and mindful eating, emphasizing that sustainable health practices do not rely on quick fixes or trendy diets. Ultimately, she encourages individuals to make informed choices based on their unique needs and to prioritize long-term wellness over immediate results.

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.

Fasting is a biological tool that can unlock your body's power—when conditions are right. Pregnancy or breastfeeding makes fasting unsafe, and other health stresses can worsen it. For women with PCOS, intermittent fasting may improve androgen balance and menstrual regularity, while chronic stress, insomnia, or adrenal issues argue for caution. Your biology and health status decide whether fasting helps. Timing matters: during the follicular phase (days 1–14) insulin sensitivity is higher, while in the luteal phase (days 15–28) insulin resistance rises and cravings grow. Fasting types include time-restricted eating, the 52-method, and alternate-day fasting. Time-restricted eating fits meals into a daily window and can aid sleep and insulin balance. Water fasting is most intensive and carries risks of nutrient gaps, electrolyte imbalance, and fatigue. The aim is a sustainable, body-responsive approach.

The balance of cortisol and melatonin is crucial for sleep. At night, our bodies are highly sensitive to light and food, which can disrupt our natural rhythms and hinder repair processes. Excessive blue light exposure and late-night eating signal the body to stay alert, leading to fatigue, brain fog, and moodiness. To improve sleep quality, it’s suggested to reduce blue light exposure at night and increase natural light during the day. Ambient light in the bedroom can also negatively impact metabolism, making it beneficial to sleep in complete darkness. Fasting is discussed as a method to enhance energy levels, with recommendations to start with a 12-hour fasting window. It’s important to stop eating two to three hours before bed to optimize metabolic function. Morning sunlight exposure is emphasized for regulating circadian rhythms and boosting metabolism. The metabolic switch that occurs during fasting can lead to increased BDNF and anti-inflammatory benefits. Women, particularly those of childbearing age, should approach fasting cautiously due to hormonal sensitivities. While fasting can be beneficial, extreme practices may disrupt menstrual cycles and overall hormonal balance. It’s advised to start gradually and monitor individual responses. Exercise is highlighted as a key factor for improving sleep quality, particularly slow-wave sleep. Caffeine and alcohol should be managed carefully, with caffeine best consumed 90 minutes after waking to avoid disrupting sleep cycles. The importance of consistent sleep schedules is reiterated, as irregular patterns can lead to feelings of fatigue and decreased performance. Community and social connections are also emphasized as vital for mental health, suggesting that fostering relationships can enhance overall well-being. Simple hosting practices, such as inviting friends over for takeout, can help maintain social ties without overwhelming effort.

Fasting can be effective for those with metabolic dysfunction, as it helps lower insulin levels. The best protein for fat loss is subjective, but white fish may have a slight metabolic advantage. Bodybuilders often switch to white fish during cuts, claiming it aids in achieving a leaner appearance. Protein sources vary in satiation; plant-based proteins offer fiber, while red meat provides high protein and fat content. Leaner cuts of meat are easier to manage in terms of calorie counting. Both plant-based and animal proteins are beneficial, but animal proteins are often considered higher quality. Shopping for high-protein foods should focus on the perimeter of grocery stores, with options like low-fat cottage cheese, Greek yogurt, and lean ground beef. Raw milk is viewed more as a supplement than a protein source. Vegan bodybuilders often meticulously plan their diets to ensure adequate protein intake, but achieving this can be challenging without careful consideration of food combinations. The debate between low-carb and low-fat diets continues, with low-carb diets often misunderstood. Low-fat diets may be effective for weight loss but are less sustainable. Both diets require careful attention to nutrient quality. The misconception that low-carb necessitates high-fat intake can lead to weight loss stalls. Fasting should be used occasionally rather than as a lifestyle to avoid metabolic slowdown. Early time-restricted eating may have benefits for weight loss and metabolic health. The speed of weight loss does not significantly impact long-term regain, but rapid weight loss can improve health outcomes. Maintaining muscle mass is important for longevity, but the balance between performance and health remains complex. Healthy relationships with food involve understanding emotional triggers and avoiding black-and-white thinking about nutrition.