The “calories in versus calories out” model is based on the idea that to maintain a stable weight, the number of calories you eat needs to match the number you expend.
“Calories in” refers to the calories you get from the foods you eat, while “calories out” is the number of calories you burn.
There are three main bodily processes that burn calories:
Metabolism, digestion, and physical activity
Metabolism, digestion, and physical activity
When the number of calories you take in from food matches the number of calories you burn to sustain your metabolism, digestion, and physical activity, your weight will remain stable.
Thus, the “calories in versus calories out” model is strictly true. You need a calorie deficit to lose weight.
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