New McMaster University study links ultra-processed foods to silent strokes and brain injuries in adults.
A nationwide study published on October 15 in JAMA Network Open revealed a possible link between consuming ultra-processed foods and an increased risk of brain damage and dementia, according to researchers in Canada.
Scientists at McMaster University evaluated more than 8,700 middle-aged adults starting from 2014 to understand how daily eating habits impact long-term brain health and neurological function.
The findings indicate that individuals consuming high levels of processed items face significant neurological risks, according to information published by dexerto.
Ultra-Processed Foods and Brain Injury Risk
Researchers found that participants whose diets consisted of more than 45 percent ultra-processed foods were over 40 percent more likely to show signs of brain injury on MRI scans.
Dr. Sonia Anand, the senior author of the study, noted that these injuries included a combination of a silent stroke and a pre-stroke profile without noticeable symptoms.
Examples of Common Processed Foods
Russell De Souza, a professor at McMaster University and registered dietitian, identified common items driving this trend, including chips, sweet breakfast cereals, sweet yogurts, and frozen food meals.
A separate 2025 report from Canada's Heart and Stroke Foundation highlighted that nearly half of the food consumed by the average Canadian citizen currently falls into this category.
Abdominal Fat and Independent Effects
The study also observed that individuals eating the most ultra-processed foods tended to accumulate more body fat, particularly fat stored deep in their abdomen.
Despite this correlation, researchers confirmed an independent effect between the dietary habits and the brain damage visible on the MRI scans, even after accounting for other health factors.
Future Research and Dietary Advice
Experts acknowledge that rising grocery prices make healthy eating challenging, but they encourage consumers to prepare meals at home, buy local, and utilize supermarket sales.
Researchers are currently bringing back participants for additional MRI scans to track brain changes over time, with the next set of findings expected in early 2028.
Frequently Asked Questions
What are ultra-processed foods linked to brain damage?
A study published in JAMA Network Open by researchers at McMaster University found that eating items like chips, sweet cereals, and frozen meals is linked to an increased risk of brain damage and dementia.Who led the study on processed foods and brain health?
Dr. Sonia Anand served as the senior author, alongside registered dietitian and professor Russell De Souza, leading the research team in Canada.What percentage of processed food raises stroke risk?
Participants whose daily diets consisted of more than 45 percent ultra-processed foods were over 40 percent more likely to show signs of brain injury and silent strokes on MRI scans.
Can eating ultra-processed foods directly cause dementia?
While the study found a strong connection between ultra-processed foods and brain injuries, researchers have not yet proven that these foods directly cause dementia or brain damage.
