This episode is brought to you by Rupa Health and Cozy Earth. Most of us can relate to feeling tired, moody, or just overall depleted. It’s not a lack of willpower or motivation that leads to low-energy. It's because we’re up against energy thieves that are hiding everywhere from our immune system to the food we eat, and even our microbiome.  In this compilation episode, I talk to Dave Asprey about using the principles of Functional Medicine and the biology of biohacking to boost energy, promote weight loss, and feel good at any age. We discuss the numerous benefits of fasting, such as reducing insulin, improving brain function, and supporting mitochondria (these are our tiny but powerful cellular energy factories)​​. Fasting doesn’t have to mean feeling stressed, tired, or even hungry—Dave tells us how to remove the fear and pain some people feel about fasting to make the process easier. Dave Asprey is the founder and Chairman of Bulletproof 360, a high-performance coffee and food company, and creator of the widely-popular Bulletproof Coffee. He is a three-time New York Times bestselling author, host of the Webby award-winning podcast Bulletproof Radio, and has been featured on the Today show, Fox News, Nightline, CNN, and dozens more. Over the last two decades Dave, the “Father of Biohacking,” has worked with world-renowned doctors, researchers, scientists, and global mavericks to uncover the latest, most innovative methods, techniques, and products for enhancing mental and physical performance.  This episode is brought to you by Rupa Health and Cozy Earth.   Rupa Health is a place for Functional Medicine practitioners to access more than 2,000 specialty lab tests from over 20 labs like DUTCH, Vibrant America, Genova, Great Plains, and more. Check out a free live demo with a Q&A or create an account here.  Right now, you can try out Cozy Earth’s bamboo pajamas and loungewear for 40% off—their highest discount ever offered. Just go to cozyearth.com and use the code HYMANPODCAST.