Think of protein, carbs or fat as colories or energy. Consume too much of any food source (more than you use up for energy) and you will gain fat.
Also remember:
Protein contains 4 calories per gram.
Carbohydrates contain 4 calories per gram.
Fat contains 9 calories per gram.
Also remember:
Protein contains 4 calories per gram.
Carbohydrates contain 4 calories per gram.
Fat contains 9 calories per gram.
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(for fat)
