Globe and Mail: ultraprocessed foods harm attention

Ultra-processed food is the category behind packaged snacks, soft drinks, instant noodles, ready meals, and a lot of the shelf-stable stuff that quietly fills modern diets. The reason this story matters is simple — the new signal is not just “junk food is bad.” It is that even a modest increase in these foods was tied to worse attention, and that link still showed up in people whose overall diets otherwise looked pretty healthy. The study came from Monash University, the University of São Paulo, and Deakin University, and it was published on April 23 in *Alzheimer’s & Dementia: Diagnosis, Assessment & Disease Monitoring*. ### What did the researchers actually look at? They analyzed 2,192 Australian adults ages 40 to 70 who did not have dementia. The team estimated how much of each person’s energy intake came from ultra-processed foods, measured cognition with the Cogstate Brief Battery, and estimated dementia risk with the CAIDE score — a tool built around modifiable risk factors rather than a diagnosis itself. (monash.edu) ### What changed with more ultra-processed food? The clearest cognitive hit was attention. For every 10% increase in ultra-processed food intake, attention scores got worse. The researchers and Monash press team translated that into a very concrete image — roughly the difference you might get from adding a standard packet of chips to your daily diet. The average participant was already getting about 41% of daily energy from ultra-processed foods, which is close to the Australian average of 42%. (alz-journals.onlinelibrary.wiley.com) ### Was it memory too? Not in this study. That is one of the more interesting details here. The association showed up for visual attention and processing speed, but not for memory loss. That makes the finding feel less dramatic than the broad “brain damage” headlines, but in a way it is more useful — attention is the basic operating system for learning, planning, and problem-solving. If that slips, a lot of other things get harder downstream. (monash.edu) ### Why does the Mediterranean-diet adjustment matter? Because it gets at the obvious objection. Maybe people who eat more ultra-processed food just eat worse overall. The team tried to account for that by adjusting for Mediterranean-diet adherence, and the attention link still held. Basically, the result points to something about the processing itself — not just the absence of vegetables, legumes, fish, or other “good” foods. (monash.edu) ### So what is “processing itself” supposed to mean? The argument is not that every factory-touched food is poison. It is that ultra-processing often strips out the natural food structure and adds emulsifiers, flavor systems, sweeteners, colors, and other industrial ingredients designed for shelf life and hyper-palatability. The study did not prove which mechanism is doing the damage, but the authors point to the possibility that additives and the altered food matrix matter in their own right. (monash.edu) ### Does this prove cause and effect? No — and that is the catch. This was a cross-sectional study, which means it captured diet and cognition at the same general time rather than following changes over years. So it can show an association, not a clean causal chain. But it lines up with a broader body of evidence linking ultra-processed foods to worse health outcomes, including cardiometabolic problems that themselves raise dementia risk. (monash.edu) ### Why are people paying attention to this one? Because the effect showed up at a realistic intake change, in midlife adults, and after a serious attempt to control for overall diet quality. That is the part that makes this feel less like generic nutrition scolding and more like a specific warning about daily focus. ### Bottom line If this finding holds up in longer studies, the practical takeaway is not exotic — fewer ultra-processed foods may help protect attention even before memory problems show up. (alz-journals.onlinelibrary.wiley.com)