Ultra-processed foods cause poor health outcomes in Americans; researchers look at their link to cognitive decline

Regular servings of hot dogs drizzled with liquid cheese may
be linked to cognitive decline. (Adobe Stock photo)

A big old hot dog, fried salami and a heaping pile of bacon may sound delicious to many Americans, but emerging research shows Americans who regularly consume processed meats are more likely to develop dementia, report Dana G. Smith and Alice Callahan of The New York Times. Processed red meat, which falls under the umbrella of ultra-processed foods, is only one part of a larger dietary equation where the traditional American diet is linked to poor health outcomes and possibly cognitive decline.

The scientists who studied processed red meat consumption "tracked more than 130,000 adults in the U.S. for up to 43 years. During that period, 11,173 people developed dementia," Smith and Callahan explain. "Those who consumed about two servings of processed red meat per week had a 14% greater risk of developing dementia compared to those who ate fewer than three servings per month." Eating unprocessed meat did not "significantly increase the risk for dementia."

Ultra-processed food is often made with ingredients most Americans don't have in their kitchen cupboards. "Products like soy protein isolate, high fructose corn syrup, modified starches, flavorings or color additives," the Times reports. "Many of these foods also have high levels of sugar, fat or sodium, which have long been known to adversely affect health." Soda, breakfast cereals, flavored potato chips, white bread and energy drinks all fall are all ultra-processed, but they "account for about 58 percent of the calories consumed by both children and adults, on average."

As for ultra-processed foods causing dementia, a body of research is growing, which "shows an association between ultra-processed foods and brain health," Smith and Callahan write. "[The studies] cannot prove that the foods directly harm the brain. And not all studies have found a consistent link between ultra-processed food consumption and cognition." Dr. Dong Wang, an assistant professor at Harvard Medical School, told the Times, "You cannot conclude that if you eat a certain amount of processed red meat, you’ll definitely get dementia. That’s not the case.”

For most people, changing diet habits is process that takes time and patience; however, experts encourage people to move away from a diet dominated by ultra-processed foods. Dr. Karima Benameur, an associate professor at Emory University School of Medicine, told Smith and Callahan, "Even modest changes over time can have an impact, and that’s important because it means it’s achievable." The Times reports, "Rather than trying to eliminate all ultra-processed foods from your diet — what Dr. Benameur calls 'a recipe for failure' — focus on cutting back on some of the worst offenders and replacing them with healthier options."