Researchers at Virginia Tech’s Fralin Biomedical Research Institute found that food processing alone changes metabolic and brain responses: when healthy adults ate two 300-calorie meals matched to within 1% for carbohydrates, fats, proteins, water, salt, and weight, the ultraprocessed meal produced a larger insulin spike, higher energy expenditure, and lower carbohydrate oxidation than the minimally processed meal, with blood glucose remaining elevated longer. Functional MRI showed differences in activity in the ventral striatum and nucleus accumbens - regions tied to motivation and reward - that correlated with the metabolic differences, even though participants did not report greater willingness to pay for one meal over the other. These results indicate processing can influence physiology and reward signaling beyond macronutrient content and help explain links between ultraprocessed diets and overconsumption or chronic disease.
The experiment used a within-subjects crossover design (57 adults enrolled; 32 completed both metabolic and fMRI sessions). Metabolic measures were taken in an airtight chamber with serial blood draws over three hours after 10 minutes of eating; foods were classified by the NOVA processing scale and exemplars included a PB&J-cookie-instant-mash combination versus banana-dried cranberries-cheese-egg. Limitations include a single small meal size, young healthy participants, different protein sources and additives between meals, and unmeasured physical/chemical food structures; follow-up work will probe other populations, larger meals, longer exposures, and specific additives or processing steps.
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