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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.

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