Whole foods leave you satisfied and stopping. Processed foods behave differently — satisfaction delayed or incomplete — though how the reward signals compare in size is not measured here. The difference the research does define is composition: fat with sodium, fat with sugar, or carbohydrate with sodium, each above a set threshold. Research by Hall showed people on an ultra-processed diet took in 508 more calories a day than on a nutrient-matched unprocessed one — while rating both equally pleasant, with eating rate rather than reward explaining the gap. Processed foods combine fat, sugar, and salt in concentrations that are rare in whole foods, combinations the research defines by threshold rather than by any comparison of reward size with whole food.
This companion covers reward system basics, how whole foods behave, how processed foods differ, the hyperpalatability factor, and why this knowledge helps. (5 min read)
Written by AI, directed and approved by me. How this is made →