Fat Burn & Sleep: What Your Body Actually Does at Night – Episode 189

This episode unpacks the popular claim that our bodies become ‘fat-burning machines’ while we sleep. Using seven peer-reviewed studies, David walks through what actually happens metabolically at night — substrate oxidation, the circadian fuel switch, the drop in total energy expenditure, how late-night eating disrupts the process, and how prolonged calorie restriction also negatively impacts sleep quality. The episode reframes fat loss away from optimization culture and diet mentality, and instead toward body trust, sleep quality, and the One Small Bite approach.

0:00 — Introduction & Hook
1:30 — The Myth: Your Body Is a Fat-Burning Furnace
3:30 — The Science: Substrate Oxidation & the Circadian Fuel Switch
6:00 — The Catch: Total Energy Expenditure Drops at Night
8:00 — Late-Night Eating: The Metabolic Disruption
11:00 — Why Sleep Quality Matters More Than Any Diet Trick
13:30 — The Body Trust Reframe
16:00 — One Small Bite: Practical Takeaways
18:00 — Wrap-Up & Call to Action

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