Eating ultra-processed foods may be quietly eroding your ability to focus, even if you otherwise eat a healthy diet, new research suggests. A study of more than 2,100 middle-aged and older adults found that higher consumption of these foods was linked to poorer attention and slower mental processing, and also with increased risk factors for dementia.
The Research
Researchers from Monash University, the University of São Paulo, and Deakin University analyzed dietary and cognitive data from 2,100+ Australian adults without dementia. The study was published in Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring.
Participants got about 41% of daily calories from ultra-processed foods (UPFs)—close to the Australian average. For every 10% increase in UPF intake, researchers observed a measurable drop in scores on tests of visual attention and processing speed. Lead author Dr. Barbara Cardoso noted that a 10% increase is roughly equivalent to adding a standard packet of chips to your daily diet.
Strikingly, the negative effect on attention appeared regardless of overall diet quality. Even participants following a healthy Mediterranean-style diet showed the same link between higher UPF intake and poorer focus, suggesting that the processing itself—not just missing out on healthy foods—may be key. UPFs include soft drinks, packaged snacks, and ready-made meals, which undergo extensive industrial processing that can introduce artificial additives.
The study also found that higher UPF consumption was associated with increased dementia risk factors like obesity and high blood pressure. While no direct link to memory loss was identified, attention is a foundational cognitive skill; declines could signal broader changes.
Why It Matters
Your ability to focus affects everything from work performance to learning new skills. Even if you prioritize healthy eating, hidden UPFs—think flavored yogurts, granola bars, or even some whole-wheat breads—might be undermining your attention. The findings suggest that diet quality goes beyond nutrients: the degree of food processing matters for brain health.
What You Can Do
- Check ingredient labels: opt for foods with fewer additives and industrial ingredients.
- Cook from scratch when possible to minimize processed components.
- Replace packaged snacks with whole fruits, nuts, or vegetables.
Source: ScienceDaily Mind & Brain
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