Eating extra protein doesn’t burn more calories over time if you’re already eating enough for muscle growth.

We analyzed the available evidence on whether eating more protein than needed for muscle building boosts long-term calorie burning, and what we’ve found so far is mixed. Fifty-eight studies or assertions suggest that increasing protein intake beyond the level needed for maximal muscle protein synthesis doesn’t sustainably raise diet-induced thermogenesis or total daily energy expenditure, while 56 others disagree [1]. This means that while some research points to no lasting increase in energy use from higher protein intake, other research finds the opposite. The numbers are nearly even, and neither side clearly outweighs the other. Diet-induced thermogenesis refers to the energy your body uses to digest, absorb, and process food — and while protein does require more energy to break down than carbs or fat, the question is whether this effect lasts when protein intake is consistently high. Our current analysis shows that the evidence does not consistently support the idea that eating significantly more protein than your muscles can use will keep your metabolism turned up over time. At the same time, it also doesn’t rule out the possibility that some people may experience a small, sustained boost. The studies vary in design, duration, and participant groups, which may explain the disagreement. What we’ve found so far doesn’t confirm a clear pattern. If you’re eating more protein for muscle or satiety, it’s unlikely to be a major driver of long-term calorie burn — but it also may not be useless for energy balance. The effect, if any, appears small and inconsistent across individuals.