Brought to you by Levels real-time feedback on how diet impacts your health, Athletic Greens all-in-one nutritional supplement, and LinkedIn Marketing Solutions marketing platform with 800M+ users.Dr. Christopher M. Palmer (@chrispalmermd) is a Harvard psychiatrist and researcher working at the interface of metabolism and mental health.Dr. Palmer is the director of the Department of Postgraduate and Continuing Education at McLean Hospital and an assistant professor of psychiatry at Harvard Medical School. For over 25 years, he has held administrative, educational, research, and clinical roles in psychiatry at Harvard. He has been pioneering the use of the medical ketogenic diet in the treatment of psychiatric disorders—conducting research in this area, treating patients, writing, and speaking around the world on this topic.He has developed the first comprehensive theory of what causes mental illness, integrating existing theories and research into one unifying theory—the brain energy theory of mental illness. You can learn more in his new book Brain Energy: A Revolutionary Breakthrough in Understanding Mental Health—and Improving Treatment for Anxiety, Depression, OCD, PTSD, and More.Please enjoy!*This episode is brought to you by Athletic Greens. I get asked all the time, “If you could use only one supplement, what would it be?” My answer is usually AG1 by Athletic Greens, my all-in-one nutritional insurance. I recommended it in The 4-Hour Body in 2010 and did not get paid to do so. I do my best with nutrient-dense meals, of course, but AG further covers my bases with vitamins, minerals, and whole-food-sourced micronutrients that support gut health and the immune system. Right now, Athletic Greens is offering you their Vitamin D Liquid Formula free with your first subscription purchase—a vital nutrient for a strong immune system and strong bones. Visit AthleticGreens.com/Tim to claim this special offer today and receive the free Vitamin D Liquid Formula (and five free travel packs) with your first subscription purchase! That’s up to a one-year supply of Vitamin D as added value when you try their delicious and comprehensive all-in-one daily greens product.*This episode is also brought to you by LinkedIn Marketing Solutions, the go-to tool for B2B marketers and advertisers who want to drive brand awareness, generate leads, or build long-term relationships that result in real business impact.With a community of more than 800 million professionals, LinkedIn is gigantic, but it can be hyper-specific. You have access to a diverse group of people all searching for things they need to grow professionally. LinkedIn has the marketing tools to help you target your customers with precision, right down to job title, company name, industry, etc. To redeem your free $100 LinkedIn ad credit and launch your first campaign, go to LinkedIn.com/TFS!*This episode is also brought to you by Levels! I wrote about the health benefits of using continuous glucose monitors (CGMs) more than ten years ago in The 4-Hour Body. At the time, CGMs were primitive and hard to use. Levels has now made this technology, and the unique insights that come from it, easy and available to everyone. Levels is making glucose monitoring simple, helping you see how food affects your health through real-time feedback. I started tracking my glucose years ago to learn more about what I should and shouldn’t be eating (including quantities, time of day, etc.), based on objective data from my own, unique physiology. Keeping my blood sugar stable is critical to my daily and long-term health and performance goals. Furthermore, poor glucose control is associated with a number of chronic conditions like diabetes, Alzheimer’s disease, heart disease, and obesity. It’s important.If you’re interested in learning more about Levels and trying a CGM yourself, go to Levels.link/Tim.*For show notes and past guests on The Tim Ferriss Show, please visit tim.blog/podcast.For deals from sponsors