Episode 2241 – On this Friday’s show, Vinnie Tortorich speaks with Dr. Jason Fung and gets your fasting questions answered, including why CICO doesn’t work, the “dawn effect”, hormones, and much more.
YOUR FASTING QUESTIONS ANSWERED
- Vinnie welcomes Dr. Jason Fung back to the show and they chat about misconceptions about what fasting is. (2:00)
- Dr. Fung explains what fasting is and how CICO (calories in, calories out) is an epic disaster.
- Weight loss isn’t about calories, it’s about hormones like insulin and allowing your cells to work.
- Vinnie asks Dr. Fung about thermodynamics and CICO. (9:00)
- Thermodynamics has nothing to do with weight gain; it applies to physics, but not physiology.
- If CICO worked, then all of the “diet businesses” (like Weight Watchers) would be out of business.
- They explain that fasting affects hormones, which is why eating throughout the day is bad advice.
- Vinnie and Dr. Fung discuss intermittent fasting as well as medical fasting: what it is, how it works, and some of its benefits. (29:00)
- They clarify whether or not fasting affects muscle growth.
- They also discuss what is happening in a “dawn effect”. (40:40)
- Vinnie brings up measuring ketones and Dr. Fung’s thoughts on that.
- They switch to discussing the hormones ghrelin and leptin, what each one does and how each works. (47:45)
- Dr. Fung clarifies what indeed breaks a fast. (55:30)
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