Overview
- A Virginia Tech study published Oct. 11, 2026 found that single ultra-processed meals produced a markedly higher insulin response than nutritionally matched minimally processed meals.
- Researchers gave 32 adults two randomized, within-subject test meals of about 300 calories that were matched within 1% for calories, carbs, fat, protein, water, and salt to isolate processing as the variable.
- Blood samples over three hours showed similar glucose curves but substantially higher insulin after the ultra-processed meal between about 40 and 120 minutes, plus higher metabolic rate, more fat burning, and less carbohydrate burning.
- In a separate fMRI test of 52 participants, activity in the striatum when viewing food images correlated with individual differences in how they burned carbohydrates after eating, linking reward‑system signals to metabolic responses.
- Authors and outside experts caution the study is small and short-term so it does not prove long-term harm; researchers plan larger, longer trials to test mechanisms such as additives or altered food structure while public-health commentary urges limiting ultra-processed food intake given high current consumption levels.