Ultra-Processed Diets Cause Excess Calorie Intake and Weight Gain : An Inpatient Randomized Controlled Trial of Ad Libitum Food Intake

Hall et al. investigated 20 inpatient adults who were exposed to ultra-processed versus unprocessed diets for 14 days each, in random order. The ultra-processed diet caused increased ad libitum energy intake and weight gain despite being matched to the unprocessed diet for presented calories, sugar, fat, sodium, fiber, and macronutrients