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Glycemic Index and Weight Loss

Don’t just Focus on Calories

Dr. Jason Fung
9 min readJan 10, 2024

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When talking about nutrition for weight loss, we often focus exclusively a single variable of foods — such as:

· Calories (Low Calorie!)

· Carbs (Low Carb!)

· Fats (Low Fat!)

· Fiber (High Fiber!)

· Protein (High Protein!)

Weight Gain Model

Such reductionist thinking on diets usually fails (See my YouTube video — Why Calorie Deficits don’t work). There are many intermediate steps between the foods we eat and the weight we gain. Physiologically, we can’t turn foods directly into body fat. A deeper understanding of this relationship is important for successful weight loss.

My book, The Obesity Code explains in more detail — weight gain is a hormonal, not a caloric imbalance, because hormones control every part of our eating journey.

Hormones control Body Fat Accumulation

There’s a simplified but entirely incorrect notion that we gain body fat because we eat a certain number of calories and we burn a certain number of calories, and the rest is…

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Dr. Jason Fung

Nephrologist. New York Times best selling author. Interest in type 2 diabetes reversal and intermittent fasting. Founder www.TheFastingMethod.com.