A diet high in protein with moderate or low carbohydrates speeds up your metabolism due to the "thermic effect" of protein. Protein has the highest thermic effect of any food (nearly 30%). For example, if you eat 100 calories of chicken breast, 30 of those calories are burned off just to digest it! Therefore, the net caloric value is only 70 calories. Too much of any food will be stored as fat, but due to its high thermic effect, protein is less likely to be converted to fat than any other food type. When carbohydrates are reduced, the ratio of protein increases, and the thermic effect of the entire diet is higher.
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