Packaged Foods Tied to Possible Silent Brain Damage

MRI scans from nearly 9,000 Canadians found tiny areas of brain damage more often in people whose diets contained the most ultra-processed food. All participants were 35–69, had no history of heart disease and came from communities across Canada. The food category included packaged snacks, sugary cereals, soft drinks, instant noodles and frozen ready-to-eat meals.

Compared with the lowest-consumption group, the heaviest consumers had 40% higher odds of showing these symptom-free brain changes. Such lesions may emerge years before memory difficulties or a clinical stroke. The relationship was more pronounced in women: those consuming the most were almost twice as likely to have signs of damage as women consuming the least. People with higher consumption also had more total body fat and deep abdominal fat, which is connected with inflammation and blood-vessel damage that may affect the brain.

Ultra-processed products accounted for roughly 25% of daily servings on average. That share reached 45% among the highest consumers and 16% among the lowest. Minimally processed foods—including fruits, vegetables and grains—represented 41% of servings in the highest-consumption group, versus 68% in the lowest. Because dietary information and brain scans were collected only once, the study cannot show that these foods caused the changes or that eating less would prevent them. Follow-up research using repeated MRI scans is underway.