The Diary Of A CEO with Steven Bartlett Most Replayed Moment: Calories In, Calories Out Is A Myth! Why Most Diets Fail - Dr. Jason Fung
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Oct 31, 2025 
Dr. Jason Fung, a Canadian nephrologist and expert in intermittent fasting, dives into the paradoxes of modern dieting. He argues that the traditional calories in versus calories out model is flawed due to metabolic adaptation and hormonal influences. Fung highlights the dangers of yo-yo dieting, explaining how it can slow metabolism. He emphasizes that food types and hormone levels are more crucial than calories alone. Intermittent fasting emerges as a revolutionary approach, countering common misconceptions about metabolic rates and meal timing.
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Calories Alone Mislead The Body
- Calories in minus calories out is misleading because the body reduces energy expenditure when calorie intake falls.
- Hormonal signals, especially insulin, control whether stored fat can be accessed or not.
The Yo-Yo Diet Metabolism Trap
- Fung describes the classic yo-yo diet where metabolism drops during dieting and stays low after.
- He explains how returning to slightly higher calories causes rapid weight regain because insulin remained high during the diet.
Use Fasting With Calorie Reduction
- Do intermittent fasting when reducing calories so insulin falls and body fat becomes available.
- Combine lower intake with fasting to allow your body to burn stored fat instead of lowering metabolism.