reSee.it - Related Video Feed

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 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.

In this episode of the Ultimate Human podcast, Gary Brecka shares five free bio hacks to enhance physical and mental well-being. 1. **Optimize Sleep**: Prioritize seven hours of quality sleep by creating a dark, cool environment, maintaining a consistent bedtime, and avoiding screens before bed. 2. **Harness Breath Work**: Controlled breathing can shift your body from stress to calm, reducing anxiety and improving mental health. Techniques like the 4-7-8 method can be practiced anywhere. 3. **Morning Sunlight Exposure**: Natural light in the morning helps regulate your circadian rhythm, boosts mood, and improves sleep quality. Aim for 5-10 minutes outside shortly after waking. 4. **Cold Exposure**: Cold showers or ice baths can enhance mood, boost immunity, and increase resilience. Start with 30 seconds of cold water at the end of your shower. 5. **Intermittent Fasting**: This eating pattern can improve metabolism, promote fat burning, and enhance cellular health. A common method is fasting for 16 hours and eating within an 8-hour window. Brecka emphasizes that these strategies are accessible to everyone and can lead to significant improvements in health and energy.

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

Johnny Cole Dickson discusses fasting and its effects on the body, particularly focusing on fat utilization and ketone production. Fasting begins in the postabsorptive state, typically 6-12 hours after eating, where the body shifts from glucose to fat for energy. He highlights various fasting protocols, including 14-hour and 16-hour fasts, showing weight loss and improved health markers. Notably, alternate day fasting with zero calories on fasting days resulted in significant fat loss. He emphasizes that food habits, rather than food choices, play a crucial role in health outcomes, suggesting that combining fasting with healthier food options could enhance results.

Fasting is not merely a weight loss strategy; it fundamentally alters cellular mechanisms that promote longevity. When fasting, insulin levels drop, allowing the body to mobilize fat stores for energy, primarily through ketogenesis. This metabolic shift enhances energy production and can lead to improved physical and mental resilience. Fasting induces hormetic stress, which can stimulate the release of brain-derived neurotrophic factor, promoting neuroplasticity and cognitive function. Additionally, fasting increases growth hormone production, aids in muscle maintenance, and initiates autophagy, where the body cleans up cellular debris, including old mitochondria. The process of fasting can be challenging initially, as individuals may experience cravings and withdrawal symptoms from food addictions. Gradual adaptation is essential, starting with intermittent fasting or meal skipping, which empowers individuals to recognize their body's signals and build metabolic flexibility. For those with obesity, a structured approach to fasting, such as a three-day water fast, can be beneficial after they have acclimated to shorter fasting periods. Medical supervision is crucial for individuals on medications like insulin, as fasting can lead to hypoglycemia. Monitoring blood pressure and glucose levels is also recommended during fasting. The conversation around fasting should focus on its potential health benefits rather than the fear of starvation, as the body is designed to adapt to periods without food. Dietary changes, particularly reducing processed foods and increasing whole foods, are vital for successful fasting. The emphasis should be on nutrient-dense foods that support metabolic health. The concept of personalized nutrition is highlighted, as individual responses to foods can vary significantly. For instance, some may thrive on high-fat diets, while others may not. The discussion also touches on the importance of polyphenols and their role in health. Foods rich in polyphenols, such as fruits and vegetables, can positively influence gut health and overall well-being. The quality of food, including the sourcing of animal products, is emphasized, as it can affect nutrient density. Biological age, as opposed to chronological age, reflects the physiological state of an individual and can be influenced by lifestyle choices, including diet, exercise, and sleep. Interventions aimed at improving biological age can lead to enhanced health span and longevity. The study discussed involved a structured eight-week program focusing on diet, sleep hygiene, exercise, and stress management, with participants experiencing significant improvements in their biological age markers. Overall, the integration of fasting, personalized nutrition, and lifestyle modifications can lead to substantial health benefits, including improved metabolic function, cognitive health, and longevity.

Fasting often stems from psychological habits rather than true hunger, which can lead to food addiction and weight issues. Autoimmunity occurs when the immune system mistakenly attacks the body’s own tissues, influenced by factors like gut microbiome imbalances and early life nutrition. The early microbiome plays a crucial role in educating the immune system, potentially preventing conditions like asthma and allergies. Advocating for practices such as delayed umbilical cord clamping can enhance iron levels in newborns, emphasizing the need for parental advocacy in health decisions. Metabolic health, including blood sugar regulation and body fat percentage, significantly impacts immune function. Leptin, a hormone produced by fat cells, regulates appetite and immune responses. Elevated leptin levels, often seen in overweight individuals, can inhibit protective immune cells, increasing the risk of autoimmune diseases. This connection between metabolism and immunity suggests that lifestyle changes, such as exercise and intermittent fasting, can be beneficial for managing autoimmune conditions. Intermittent fasting and time-restricted eating can reduce inflammatory biomarkers linked to autoimmune diseases. Studies indicate that early time-restricted feeding may enhance metabolic health and longevity by aligning eating patterns with the body's circadian rhythms. For those with autoimmune conditions, fasting can be a useful tool, but it must be approached carefully, especially for individuals with low body fat or specific health issues. Leptin resistance can occur in overweight individuals, leading to constant hunger despite sufficient energy stores. This resistance can exacerbate inflammation and increase the risk of autoimmune conditions. Improving metabolic health through diet and exercise can help restore leptin sensitivity and support immune function. Micronutrient deficiencies, particularly vitamin D, are associated with lower levels of T regulatory cells, which are crucial for immune regulation. Vitamin D supplementation has shown promise in managing autoimmune conditions. Dietary approaches, such as avoiding lectins, can also benefit those with autoimmune issues, although the relationship between diet and microbiome health remains complex. Fasting can help individuals recognize emotional eating patterns and develop a healthier relationship with food. While fasting can be beneficial, it is essential to avoid extremes and personalize fasting protocols based on individual health and lifestyle. Electrolyte balance is crucial during fasting, as inadequate sodium and potassium can lead to negative effects. Incorporating salt and electrolytes can enhance the fasting experience and support overall health. The timing of meals, particularly avoiding late-night eating, can improve sleep quality and metabolic health. Ultimately, fasting should be approached as a flexible tool, tailored to individual needs and circumstances, rather than a rigid regimen.

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.