Whole foods trigger proportional reward—you eat, feel satisfied, stop. Processed foods trigger disproportionate reward—the signal is amplified beyond what calories warrant. Research by Hall showed people eating ultra-processed foods consume about 500 more calories daily than those eating whole foods, even when matched for nutrients. Processed foods combine fat, sugar, and salt in concentrations that don’t exist in nature, hitting the brain’s reward system harder than it evolved to handle.
This companion covers reward system basics, how whole foods behave, how processed foods differ, the hyperpalatability factor, and why this knowledge helps. (4 min read)