Glossary /
Protein Leverage
The hypothesis that humans keep eating until protein needs are met — so diluting protein with carbs and fats drives overeating.
What it is
The protein leverage hypothesis, developed by ecologists Stephen Simpson and David Raubenheimer, proposes that humans (and many animals) defend an absolute protein target more strongly than a calorie target. If the food on offer is protein-poor — say, ultraprocessed snacks heavy in refined carbohydrate and seed oil — you keep eating until you have accumulated enough protein, by which point you have also consumed a large surplus of calories.
Why it matters
It is one of the cleanest explanations for the obesity curve of the last fifty years that does not require villainising any single macronutrient. It predicts what most strength coaches already know: anchor each meal with adequate protein (roughly 1.6 to 2.2 g per kg of lean mass per day for active adults) and overeating elsewhere tends to take care of itself. The mechanism is not willpower — it is the appetite system getting the signal it is looking for.