t takes energy to digest your food - commonly referred to as the thermic effect of food (TEF). And as it turns out, each macro requires a different amount of energy to digest.
Protein is thought to be the most thermogenic of all the macros - causing a small spike in metabolism to digest protein foods compared to fat and carbs (2). And it is commonly believed that eating more protein overall may lead to tiny increases in your daily metabolism and overall energy expenditure.
TEF only accounts for 10% of your total energy expenditure, but because dieting is associated with decreases in metabolism over time - due to prolonged caloric restriction and decreases in mass, this minor effect on metabolism may be worth considering (3,4).