Excessive Processed Food Intake Linked to Cognitive Decline, Study Finds

Anna Devinskaya, a biochemist specializing in nutrition and eating behaviors, stated that excessive consumption of fast food can negatively impact cognitive functions and disturb the balance of gut bacteria.

Devinskaya highlighted that highly processed foods—such as potato chips, burgers, sugary drinks, and ready-made pastries—are not only convenient and quick to consume but also lack many essential nutrients vital for brain health.

She explained that these foods contain high levels of saturated fats, refined carbohydrates, salt, and additives, which limit their nutritional value relative to the needs of the body and brain.

According to Devinskaya, a study involving 10,775 participants found that individuals deriving a large portion of their daily calories from fast food experienced a faster decline in cognitive abilities over an eight-year follow-up period.

"The overall rate of cognitive deterioration was 28% higher among these individuals, while the decline in executive functions increased by 25% compared to those who consumed fewer highly processed foods," she said.

Devinskaya emphasized that executive functions play a critical role in decision-making, planning, task management, and adapting to various situations. She noted that excessive intake of sugary and highly processed foods may adversely affect verbal skills and information processing speed.

She added that the exact mechanisms behind these effects remain under investigation, but researchers have identified several possible pathways, including low-grade chronic inflammation, disruption of the gut microbiome balance, oxidative stress, and the direct impact of saturated fats on the structure and functions of the brain’s prefrontal cortex.

Devinskaya pointed out that 78.5% of published studies in this field documented a link between excessive consumption of highly processed foods and declines in cognitive performance, including memory, executive functions, and general cognition. However, she noted that a direct causal relationship still requires further scientific evidence.

She concluded by underscoring the high consistency of current findings, highlighting the importance of healthy nutrition in maintaining brain efficiency and mental capabilities, especially when performing tasks that demand concentration and critical decision-making.