New research shows that eating ultra-processed foods (UPFs) may directly harm your brain’s ability to focus. A study from Monash University, the University of São Paulo, and Deakin University found that even a small daily increase in UPFs—like adding one packet of chips—leads to a measurable drop in visual attention and processing speed, regardless of how healthy the rest of your diet is.
The Research
Published in Alzheimer’s & Dementia: Diagnosis, Assessment & Disease Monitoring, the study followed over 2,100 dementia-free Australian adults (middle-aged and older) for an extended period. Participants consumed an average of 41% of their daily energy from UPFs, similar to the national average. Researchers measured their cognitive function using standardized tests for visual attention and processing speed.
Lead author Dr. Barbara Cardoso from Monash University explained that for every 10% increase in daily energy from UPFs—roughly one standard bag of chips or a soft drink—participants showed a distinct and measurable drop in attention scores. This effect held even for those otherwise eating a healthy Mediterranean diet. The researchers suggest that food processing itself, including the destruction of natural food structure and the introduction of artificial additives and industrial chemicals, may trigger cognitive decline through mechanisms like neuroinflammation.
Why It Matters
Attention is the foundation for learning and problem-solving. Eroding this cognitive skill increases long-term dementia risk. While the study did not find a direct link to immediate memory loss, the decline in attention could impair daily functioning and cognitive reserve over time. The findings highlight that the degree of food processing matters, not just the nutrient content.
What You Can Do
Reducing UPFs doesn't mean eliminating all convenient foods. Try swapping packaged snacks for whole fruits, vegetables, nuts, or homemade alternatives. Read ingredient labels and aim to choose foods with fewer additives. Even small reductions can benefit your brain health.
Source: Neuroscience News
Curious about your own brain? Take our free adaptive IQ test or try 306 brain training levels.
