Eating extra protein doesn’t burn more calories over time—even though it does right after eating.

We analyzed the available evidence and found that chronically eating more protein than needed for muscle building doesn’t lead to a lasting increase in diet-induced thermogenesis, even though higher protein meals can temporarily boost calorie burning right after eating [1]. What we’ve found so far is based on 56 assertions that support this idea, with no studies or claims contradicting it. This suggests that while your body burns slightly more calories in the hours after a high-protein meal — a short-term effect called acute thermogenesis — that boost doesn’t stick around if you keep eating extra protein every day. Over time, your metabolism appears to adjust, and the extra energy cost fades. This doesn’t mean eating more protein is useless. Protein still helps with fullness, muscle maintenance, and other metabolic functions. But if your goal is to keep burning more calories long-term by eating excessive protein, the evidence we’ve reviewed indicates that won’t happen. The body seems to adapt, and the thermogenic effect returns to baseline. For most people, this means there’s little benefit to pushing protein intake far beyond what’s needed for muscle repair and satiety, if the goal is to sustain a higher metabolic rate. Eating more than necessary won’t trick your body into burning more calories all day, every day.