Dr. Rhonda Patrick speaks with Ray Cronise, a former NASA material scientist and co-founder of zero gravity, a company that offers weightless parabolic flights to consumers and researchers. In this episode, coming at the tail end of a rather extreme 23-day water fast for Ray, we discuss, perhaps unsurprisingly, some of the benefits that are associated with fasting! Ray talks about shifting one's perspective from looking at nutrition only through the lens of meeting day-to-day nutritional needs, and instead, also considering optimizing metabolism for longer-term effects as well, the importance of thinking about longevity in the context of functional healthspan, some of the similarities between the body’s physiological response to heat stress, cold stress, and exercise and so much more. EPISODE LINKS: Show notes and transcript: https://www.foundmyfitness.com/episodes/ray-cronise?utm_source=youtube&utm_medium=youtube&utm_campaign=cronise_interview Ray Cronise on Twitter: https://twitter.com/RayCronise PODCAST INFO: Email: https://www.foundmyfitness.com/newsletter?utm_source=youtube&utm_medium=youtube&utm_campaign=cronise_interview Apple Podcasts: https://podcasts.apple.com/us/podcast/foundmyfitness/id818198322?i=1000532219838 Spotify: https://open.spotify.com/episode/5IWeXTWxDzVM0Xkg8RNhYt?si=H7I3IYiSQj-lmWI685RDsg&nd=1 Full interview playlist: https://www.youtube.com/playlist?list=PLJEEAVzHu9KzgkQbe2Thh35VU-HCiId_s Clips playlist: https://www.youtube.com/playlist?list=PLrGxo-5Uw8gI9-1IStYEvNxVukKxZBlmi Chapters 00:00:00 - Introduction 00:00:17 - 21 day fast 00:05:11 - Avoiding malnutrition 00:17:19 - Food pyramid 00:20:41 - Biomarkers of aging 00:22:36 - Gut health 00:25:23 - Metabolism 00:34:30 - Ray's diet 00:44:18 - Intermittent fasting 00:48:14 - Hunger 00:58:41 - Macronutrient debate 01:08:44 - Cold stress 01:23:46 - Weight loss 01:30:55 - Exercise overlap 01:41:26 - Burning fat 01:50:00 - Ray's daily habits SCIENCE OF HEALTHSPAN EMAIL NEWSLETTER: Receive emailed episode notifications and regular updates on the emerging science of healthspan. https://www.foundmyfitness.com/newsletter?utm_source=youtube&utm_medium=youtube&utm_campaign=cronise_interview SUPPORT THE CHANNEL: Premium subscribers of FoundMyFitness get access to a Google Presentation for the graphics in videos, earlier access, a two-times-per-month science news digest and commentary, and some kind of live online event usually every month. Learn more at: https://www.foundmyfitness.com/crowdsponsor?utm_source=youtube&utm_medium=youtube&utm_campaign=cronise_interview Thank you for watching! SOCIALS: https://twitter.com/foundmyfitness https://facebook.com/foundmyfitness https://instagram.com/foundmyfitness PODCAST: Apple Podcasts: https://podcasts.apple.com/us/podcast/foundmyfitness/id818198322 Spotify: https://open.spotify.com/show/5QjpaU0o1Q2MkVZwwG3y7d