New Research Associates Ultraprocessed Foods With Cognitive Decline, With Processed Meat Topping the List

What you eat can play a role in how well your brain ages, and a new study adds fresh evidence to that idea.

Researchers found that older adults in the United States who consumed more ultraprocessed foods (UPFs) had a significantly higher risk of cognitive impairment and dementia. Among the food groups examined, processed meat appeared to be the most concerning.

What the study examined

The study, published in the American Journal of Public Health, drew on data from thousands of older adults enrolled in the Health and Retirement Study. Participants reported their eating habits over time, and their memory and cognitive function were tested every two years.

Researchers sorted participants by their level of UPF intake using the NOVA classification system, which categorizes foods by how heavily they are industrially processed rather than by nutrient content alone. The analysis looked at total UPF intake as well as specific subcategories such as processed meats, ultraprocessed drinks, sweets, savory snacks, ready-to-eat meals, and others.

Cognitive health was measured in two ways: cognitive impairment with no dementia (CIND), which refers to measurable memory or thinking problems that do not yet meet the standard for a dementia diagnosis, and dementia itself. That approach allowed the researchers to assess the full range of cognitive decline.

Ultraprocessed food and brain health

People with higher UPF intake were more likely to develop both CIND and dementia than those who ate fewer ultraprocessed foods. The association remained after accounting for factors such as age, sex, physical activity, smoking, and total calorie intake.

The result fits into a broader body of evidence. A 2026 systematic review of 14 studies found that 78.5% reported a significant link between greater UPF consumption and worse cognitive outcomes, including weaker memory, executive function, and overall cognition.

When the researchers looked at UPF categories separately, one group stood out most clearly: processed meat had the strongest connection to cognitive risk.

That finding matches a separate 2025 study that also used Health and Retirement Study data and found that ultraprocessed animal products were linked to a 17% higher risk of cognitive impairment.

Why processed meat may be especially hard on the brain

Processed meat is not only ultraprocessed; it also contains a mix of ingredients and compounds that may be particularly harmful over time.

A 2025 narrative review on UPFs and brain health pointed to several possible mechanisms. High-heat processing can create harmful byproducts that damage cells throughout the body, including brain cells. These foods may also disrupt gut bacteria, which can affect brain function. Over time, that combination may contribute to inflammation and cellular damage in the brain.

Processed meats are also typically high in saturated fat and sodium nitrates, both of which are independently associated with inflammation. In addition, they can replace more protective foods in the diet, lowering intake of fiber, antioxidants, and other nutrients that support brain health.

Researchers say it is likely this combination of effects, rather than any single ingredient, that explains why processed meat stands out in the data.

What this means for everyday eating

The study also found that people who ate more minimally processed foods had a lower risk of cognitive decline, suggesting that the overall quality and processing level of the diet matters.

This is less about banning one food and more about making practical adjustments that can add up:

• Replace processed deli meats with whole protein sources: Try grilled chicken, canned salmon, hard-boiled eggs, or legumes for sandwiches and snacks.
• Check labels on packaged products: UPFs often come with long ingredient lists that include additives, emulsifiers, and flavor enhancers. If the ingredients are hard to recognize, the food is likely ultraprocessed.
• Make whole or minimally processed foods the base of most meals: Fruits, vegetables, whole grains, nuts, seeds, and unprocessed proteins support a brain-friendly diet.
• Cut back instead of aiming for perfection: The research reflects long-term eating patterns, not isolated meals. Lowering overall UPF intake, especially processed meat, can still make a meaningful difference.

The bottom line

Dementia is often viewed as something driven mainly by genetics or fate, but this research suggests daily food choices also matter. The evidence connecting ultraprocessed foods to cognitive decline continues to grow, and processed meat appears to be the biggest concern.

The encouraging takeaway is that minimally processed foods may help lower cognitive risk. What you eat may influence how your brain works decades from now, and the next meal is a good place to start.