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Alzheimer's disease has traditionally been viewed as a result of amyloid beta plaques and neurofibrillary tangles in the brain, which can only be confirmed postmortem. This has led to a need for a paradigm shift in understanding the disease. Emerging research suggests a metabolic theory of cognitive decline, indicating that markers of metabolic health, such as fasting insulin and glucose levels, may be more predictive of Alzheimer's risk than age. A Finnish study found that fasting insulin was a stronger predictor of Alzheimer's than age. The hippocampus, crucial for memory and learning, relies on glucose and ketones for energy. Insulin regulates glucose transport in the hippocampus, and as insulin resistance develops, the brain struggles to access glucose, leading to an energy deficit. This has led some researchers to label Alzheimer's as "type 3 diabetes," highlighting the connection between insulin resistance and cognitive decline. Insulin's role extends beyond glucose control; it affects every cell in the body. Chronic high carbohydrate intake leads to elevated insulin levels, causing insulin resistance and metabolic dysfunction. This dysfunction can manifest in various health issues, including cognitive decline, PCOS, and erectile dysfunction, all linked to insulin resistance. Research indicates that even in early cognitive decline, glucose metabolism in the brain is impaired while ketone metabolism remains intact. Studies show that dietary changes, particularly reducing carbohydrates and increasing healthy fats, can improve cognitive function. The food we consume plays a critical role in either exacerbating or alleviating chronic diseases, including Alzheimer's. To combat cognitive decline, individuals should focus on improving metabolic health through dietary changes, such as reducing refined carbohydrates and increasing healthy fats. This approach not only addresses Alzheimer's risk but also enhances overall well-being. The message is one of empowerment: individuals can take control of their health through informed dietary choices.

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.

Sara Gottfried discusses dietary recommendations for women to harmonize with their hormones, sharing her personal journey with food addiction and weight management. In her mid-30s, she realized her Mediterranean diet was contributing to weight gain due to excessive carbohydrates and alcohol. She shifted to a low-carb Mediterranean diet, focusing on non-starchy vegetables, increased protein, and healthy fats, which helped stabilize her blood sugar and improve her metabolic health. Gottfried emphasizes the importance of individual experimentation (N of one) in dietary choices, particularly using continuous glucose monitors (CGMs) to track blood sugar responses to different foods. She advises minimizing ultra-processed foods and increasing fiber and protein intake, highlighting that healthy fats are crucial for hormone production. She explains that cholesterol is the backbone of sex hormones, and quality fats from plants and animals are essential. For assessing metabolic health, she recommends standard tests like fasting glucose and hemoglobin A1C, but stresses the importance of also measuring insulin levels, as insulin changes can precede glucose changes by years. Advanced testing, such as insulin resistance scores and liver function tests, can provide deeper insights into metabolic health. Gottfried asserts that controlling blood sugar is vital for overall well-being, especially for women in menopause. She notes that many women experience a glucose rollercoaster due to poor dietary choices, leading to symptoms like fatigue and mood swings. Continuous glucose monitoring can help individuals understand their unique responses to foods, enabling better dietary choices. She discusses the impact of cortisol on health, particularly its role in weight gain and stress. High cortisol levels can lead to increased abdominal fat and other health issues. Gottfried suggests that managing cortisol through lifestyle changes, including stress reduction techniques like meditation and yoga, is crucial for hormonal balance. Gottfried also addresses the importance of thyroid health, noting that many women experience thyroid dysfunction as they age. She recommends comprehensive thyroid testing, including antibodies, to identify autoimmune conditions like Hashimoto's. She emphasizes that lifestyle factors, including diet and stress management, can significantly influence thyroid health. The conversation touches on the rising prevalence of autoimmune diseases, particularly among women, and the role of trauma and stress in exacerbating these conditions. Gottfried highlights the need for a holistic approach to health, considering the interplay of hormones, diet, and lifestyle factors. Lastly, she discusses the importance of sleep, particularly for women experiencing hormonal changes. Sleep disturbances can exacerbate cortisol issues and metabolic health problems. Gottfried advocates for prioritizing sleep hygiene and addressing underlying issues, such as acid reflux, that may disrupt sleep. Overall, Gottfried encourages women to take charge of their health by understanding their unique hormonal profiles, experimenting with dietary changes, and addressing lifestyle factors that contribute to hormonal imbalance and metabolic health issues.

Insulin resistance is a widespread health issue, primarily driven by high carbohydrate intake, particularly processed sugars and starches. To combat this, it is recommended to focus on whole carbohydrates from fruits and vegetables, prioritize high-quality animal proteins over plant proteins, and incorporate healthy fats, as fats do not spike insulin levels. Intermittent fasting or time-restricted eating can also help maintain low insulin levels. Muscle plays a crucial role in glucose consumption, utilizing an insulin-independent mechanism to absorb glucose during exercise, which can enhance insulin sensitivity. Post-exercise carbohydrate consumption can negate these benefits. Ketones, produced during fat breakdown, serve as an alternative energy source for the brain, protecting muscle mass by reducing reliance on glucose. Research indicates that insulin resistance is linked to various health issues, including Alzheimer's disease, erectile dysfunction, and polycystic ovary syndrome (PCOS). Insulin resistance can lead to chronic diseases, as it affects blood vessel function and hormone production. Stress and inflammation also contribute to insulin resistance, with sleep deprivation exacerbating the issue. Dietary choices significantly impact metabolic health. Many gluten-free products, often made with refined starches, can spike blood sugar levels more than traditional wheat products. Continuous glucose monitoring can help individuals identify how foods affect their insulin sensitivity, empowering them to make healthier choices and potentially reverse insulin resistance.