The dominant public understanding of why ultra-processed foods are bad for health runs something like this: they contain too many calories, too much sugar, too much saturated fat, too much sodium, and too little fiber and micronutrients. Fix the nutrient profile, and the problem is solved.
New science published June 17, 2026, suggests this understanding is incomplete in a fundamental way — and the gap may explain why ultra-processed food harms health in ways that cannot be fully reversed simply by eating well the rest of the time.
