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Which one of the "big 3" macronutrients is the most calorically dense at 9 calories per gram?

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Fat is by far the most calorie loaded of the macronutrients, containing 9 calories per gram compared to only 4 calories per gram for proteins and carbohydrates. Although a low fat diet is generally desirable for persons who would like to restrict their caloric intake, a no fat diet is no recommended by nutritionists or doctors since there is a dietary need for some fat in the diet.
User Mario A
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