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The reasoning behind The 100

This book claims that the “calories in, calories out” theory is incorrect. Insulin is the main regulator of fat storage and mobilization, and we secrete insulin primarily in response to the carbohydrate content of the diet. The more carbs and the less fat in the diet, the more insulin you secrete, and this affects weight. All carbohydrates are in essence a form of sugar, and this diet counts and limits carbohydrate calories as “Sugar Calories.”