Food provides your body with a variety of nutrients, including three main categories that dole out energy in the form of calories: carbs, fats and proteins. Your body has to expend energy in order to digest and process any food you eat. The amount of energy required varies based on the food.
The term negative-calorie food typically refers to a food which supposedly takes more calories to eat, digest and process than it naturally contains and gives to your body. If these foods exist, you could theoretically lose weight by eating them, as you would use more calories eating and digesting them than you gain from their calorie content.
Negative-calorie foods supposedly require more energy to digest and process than they actually provide to your body. Fruits and vegetables with high water content and few calories are often marketed as negative-calorie, but actually are not. There is no such thing as negative-calorie food...
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