Higher consumption of ultra-processed foods is associated with an increased risk of dementia and cognitive decline, according to a new study [1, 2, 3].

These findings highlight a critical intersection between dietary habits and long-term brain health. As processed diets become more prevalent, the potential for widespread cognitive impairment poses a substantial challenge to public health systems and aging populations.

Researchers at Harvard's T.H. Chan School of Public Health and other scientists published the study in the American Journal of Public Health [2]. The data indicates that people consuming over two pounds of ultra-processed foods per day face a 58% higher risk of dementia [1, 4].

The same high-consumption group also showed a 46% higher risk of cognitive impairment [1]. The study said that every 10% increase in the consumption of these foods is linked to measurable declines in cognitive function, and visual attention [5].

Scientists said that ultra-processed foods may contribute to these risks through inflammatory effects and nutritional deficiencies [2, 3]. The risk appears particularly pronounced among older adults who are socially isolated [2, 3].

Ultra-processed foods typically include industrial formulations of food that contain substances not commonly used in home cooking, such as hydrogenated fats and modified starches. The researchers focused on how these dietary patterns correlate with the onset of dementia and the acceleration of mental decline in the U.S. population [2].

“People consuming over two pounds of ultra-processed foods per day face a 58% higher risk of dementia.”

This study underscores the role of nutrition as a modifiable risk factor for dementia. By identifying a specific threshold—two pounds of ultra-processed foods daily—and highlighting the vulnerability of socially isolated seniors, the research suggests that public health interventions must address both food quality and social support systems to mitigate cognitive decline.