Does Calories In, Calories Out Actually Work? @DrStacySims
Does Calories In, Calories Out Actually Work?  @DrStacySims
Uploaded August 2026 | Updated September 2026, 2 weeks ago
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What if everything you were told about calories, sleep, and hunger was only half the story, and the missing piece was hiding inside your cells? Could the timing of your light exposure, meals, and even when you sit on the couch at night be quietly sabotaging your health?

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I’m Dr. Stacy Sims, exercise physiologist, nutrition scientist, and author of ROAR and Next Level. My mission is simple: stop training women like small men. I help you understand and work with your physiology - for better performance, health, and longevity.

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Does Calories In, Calories Out Actually Work?

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