Dr. Rhonda Patrick speaks with Ray Cronise, a former NASA material scientist and cofounder 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 23day 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 daytoday nutritional needs, and instead, also considering optimizing metabolism for longerterm 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.

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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

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PODCAST:
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