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Dr. Huberman reframes cortisol not as an enemy but as a crucial energy mobilizer that primes wakefulness in the first hour after waking. He explains the cortisol awakening response as a healthy, evolutionarily designed burst that fuels glucose mobilization and mental readiness, enabling a day of focus, learning, and action. The discussion then maps how morning light, hydration, and light exercise amplify this cortisol spike, while late-day stress can be managed by strategically lowering cortisol through dim lighting, breath, and limiting late caffeine. The interview emphasizes that a properly timed cortisol curve—high in the morning, tapering through the day, and low at night—drives circadian rhythm, mood, sleep quality, and even recovery from treatments like chemotherapy. A key point is that burnout and chronic fatigue often reflect a mis-timed cortisol profile, not a failure of willpower, and that one’s personal schedule and light exposure can realign this curve to restore energy and sleep architecture. The guests explore practical interventions for sleep difficulties, including adjusting carbohydrate timing, reintroducing starch in the day, and even subtle techniques to reduce sensory input before bed. They discuss the glymphatic system, the brain-wide waste-clearance process that peaks during deep sleep, and how side sleeping with a modest head elevation can optimize clearance and reduce brain fog. The conversation then broadens to learning and habit formation, highlighting how thoughts emerge from layered sensory memories, and how reducing pre-sleep sensory load can bolster focus and retention. Finally, they touch on broader life strategies—prioritizing sleep, evolution-informed dietary nuance (fermented foods, fiber, and gut health), and the value of psychology, meaning, and even spirituality as top-down regulators that complement neuronal circuits in sustaining resilience and long-term health.

Welcome to the Huberman Lab podcast. I'm Andrew Huberman, a professor at Stanford, and today we're discussing cortisol, its importance, and how to manage it to avoid or overcome burnout. Cortisol is often labeled as a stress hormone, but it plays a crucial role in energy deployment and overall well-being. The key takeaway is to maintain a proper cortisol rhythm: high in the morning shortly after waking and low in the evening before sleep. This rhythm is essential for health, mood, sleep, and performance. If you're feeling burnt out, wired and tired, or experiencing morning anxiety, adjusting your cortisol rhythm can help. Cortisol is produced in the adrenal glands and is involved in energy regulation, particularly glucose release into the bloodstream. It acts on a slower time scale compared to adrenaline, which is released quickly in response to stress. Understanding cortisol's role as an energy hormone rather than just a stress hormone is crucial. Your cortisol levels fluctuate throughout the day, with a specific pattern: minimal secretion before sleep, a slight rise during the early hours of sleep, a significant increase during the last hours of sleep, and a sharp spike upon waking. This spike is known as the cortisol awakening response (CAR), which is vital for feeling alert in the morning. To optimize cortisol levels, get bright light exposure within the first hour of waking. Sunlight is best, but a 10,000 lux artificial light can also work. Hydration is also important; drinking water first thing in the morning can help increase alertness and cortisol levels. Caffeine can be beneficial but should be consumed later in the morning to avoid a sharp decline in cortisol levels. Exercise is another effective way to manage cortisol. Regular exercise at the same time each day can help anchor your cortisol rhythm. However, exercising late in the day can spike cortisol levels, which may disrupt sleep. If you must work out later, ensure you consume starchy carbohydrates afterward to help lower cortisol. In the evening, it's essential to keep cortisol low. Dim lights and avoid bright screens, especially those emitting blue light, which can increase cortisol levels. Engaging in calming activities, such as breathing exercises or non-sleep deep rest (NSDR), can help reduce stress and lower cortisol. For those experiencing burnout, there are two patterns: one where individuals wake up stressed and crash in the afternoon, and another where they feel sluggish in the morning but are wired at night. Each pattern requires different strategies to manage cortisol effectively. Supplements like ashwagandha and apigenin can help lower cortisol levels, but they should be used in conjunction with behavioral strategies. Ashwagandha can reduce cortisol by 11% to 29%, while apigenin, found in chamomile tea, can also be beneficial. Understanding and managing your cortisol rhythm is crucial for overall health, mood, and cognitive function. By implementing these strategies, you can improve your energy levels, focus, and sleep quality. Thank you for joining today's discussion on cortisol. If you enjoyed this episode, please subscribe and check out the sponsors mentioned.

Carbs aren't the enemy. They're energy for work and growth, and when used correctly they can help you build muscle and burn fat. Excess calories—not carbohydrates—drive fat gain, and protein has a higher thermic effect than fats or carbs. The hosts trace the low-carbohydrate backlash to the Atkins era, noting how the wave of diet myths can cycle from vegan to carnivore and back, fueled by social media and sensational books. Carbs, they explain, are essential for energy during intense training and for sustained performance, especially in power, strength, and sprint work. They discuss which carbs are easy to digest to maximize performance: white rice, sweet potatoes, and fruit, while gluten-containing or highly processed breads and pastas can cause issues for many people. They advise avoiding gluten-containing carbohydrates when calories and macros are equal, as gluten can be hard to digest and processed options slow you down. For workouts, a couple hours before a hard effort is typically beneficial, though some athletes perform well in fasted states depending on prior meals. They also note that endurance-type activities may be less carb-dependent than high-intensity power efforts. Post-workout carbohydrates support recovery and glycogen replenishment, and a window after training is discussed with nuance. The GLUT4 mechanism and insulin help shuttle amino acids and fluids into muscle, but the practical takeaway is to use carbs strategically—before for energy, after for recovery, and in accordance with daily activity. They emphasize a few practical habits: eat carbohydrates after a hard session if you plan another workout soon; eat protein and fats first in meals to stabilize blood sugar and limit cravings; avoid drinking carbs habitually because it’s easy to overconsume. Carbohydrate timing also touches sleep: some people sleep better with carbs at dinner because serotonin and melatonin can be supported by carbohydrate intake, while others experience sleep disruption from blood-sugar spikes. The speakers stress that carbohydrates are not essential, so dieters can adjust intake to activity level and goals. They discuss carb cycling and daily undulations, noting that varying grams across days can help manage calories without sacrificing essential protein and fats. The broader point is that carbs are a flexible tool, best used with attention to digestion, timing, and personal response.