New Research Links Ultra-Processed Foods to Brain Damage and Higher Stroke Risk
A study of more than 8,700 Canadians found that high consumption of ultra-processed foods was linked to a 40 percent higher likelihood of vascular brain injuries, which can serve as precursors to stroke and dementia. Researchers found the risks persisted even among people who otherwise followed healthy diets.
A study of more than 8,700 Canadians found that high consumption of ultra-processed foods was linked to a 40 percent higher likelihood of vascular brain injuries, which can serve as precursors to stroke and dementia, according to research reported in October 2026.
Participants whose ultra-processed food intake made up nearly 50 percent of their daily caloric intake showed the highest risk. Researchers found the risks persisted even among individuals who otherwise adhered to healthy, plant-rich diets like the Mediterranean diet, suggesting the harm stems specifically from the ultra-processing of food rather than general diet quality.
A separate study of 2,192 dementia-free Australians found that for every 10 percent increase in daily ultra-processed food intake, there was a measurable decline in attention and a 0.24-point increase on a 20-year dementia risk scale.
Structural brain changes, including reduced gray matter volume and cortical deterioration, have been observed in individuals with high ultra-processed food intake in data analyzed from the UK Biobank.
Processed meats showed the strongest association with cognitive risk among all ultra-processed food subcategories. Researchers said the physiological mechanisms involved include systemic inflammation, which may cross the blood-brain barrier, and the worsening of cardiovascular risk factors such as obesity, type 2 diabetes, hypertension, and high LDL cholesterol.
A review of studies involving approximately 10 million people found that increased ultra-processed food intake is associated with a 20 percent higher risk of depression, a 55 percent higher risk of obesity, a 41 percent higher risk of sleep disorders, and a 40 percent higher risk of developing type 2 diabetes.
Experts said reducing intake, even incrementally, can provide cognitive and health benefits. Research suggests that replacing ultra-processed items with minimally processed whole foods over five to six years can potentially lower the risk of cognitive decline.
