The protein leverage hypothesis: humans have a strong drive to consume specific protein amounts. Research by Simpson and Raubenheimer shows if protein is diluted by carbs and fats, we overeat total calories to hit our protein target. A drop from 15% to 10% protein can increase intake by 12%. Modern processed foods are low-protein — the body keeps seeking.
This companion covers the discovery, human evidence, why protein is defended, the processed food problem, and practical implications. (3 min read)