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Between the daily rush and convenience, common mealtime choices can exact a silent toll on the brain. Research indicates that processed meats and soft drinks accelerate memory and reasoning losses.
According to Virginia Tech, professors Ben Katz, from the Department of Human Development and Family Science, and Brenda Davy, from the Department of Human Nutrition, Foods, and Exercise, published the results of a seven-year study in the American Journal of Clinical Nutrition that identified two types of ultra-processed foods with a specific and stronger association with cognitive decline: processed meats and sugary drinks.
The study followed Americans aged 55 and older between 2013 and 2020, testing the same participants every two years with exercises that measured immediate memory, delayed memory, attention, and problem-solving ability. The results showed that consuming at least one serving of processed meat per day is associated with a 17% higher risk of cognitive impairment, while drinking a daily soft drink is associated with a 6% higher risk.
The decline observed in the highest consumers was equivalent to an additional 1.6 years of brain aging compared to those who consumed less. “It’s important to understand when and why people develop early stages of cognitive impairment,” Katz said. “Doctors should be able to tell patients that their food choices matter.”
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Processed Meats and Cognitive Decline: The Highest Risk Among All Ultra-Processed Foods
The most relevant aspect of the Virginia Tech study is not to show that ultra-processed foods are bad — science already knew that. It is to identify which specific categories have the strongest association with brain health.
Katz and Davy analyzed multiple categories of ultra-processed foods and found that processed meats and sugary drinks stood out from the rest. Other ultra-processed foods such as snacks, industrial cakes, and packaged breads also frequently appeared in participants’ diets, but their association with cognitive decline was less pronounced than that of meats and soft drinks.
One processed meat item per day — a hot dog, a slice of bologna, a piece of sausage — was already enough for the observed increase in risk. The volume is low enough to be within the habitual consumption of millions of Brazilians who include these foods in breakfast, lunch, or snacks without considering them a risk to brain health.
Seven Years of Follow-Up: How the Study Measured Brain Aging
The longitudinal design of the study — following the same people for seven years instead of measuring everything at a single point — is what gives solidity to the conclusions. Associations observed at a single moment can be coincidences. Associations that persist over seven years and deepen over time carry different scientific weight.
The tests applied every two years measured different cognitive functions: immediate word recall, delayed recall of the same words after an interval, countdown with successive subtractions, and other exercises that distinguish degrees of impairment from mild impairment — a pre-dementia stage — to more severe declines.
The database used was the Health and Retirement Study, one of the largest longitudinal studies on aging in the United States, with tens of thousands of participants. Using a database of this scale instead of a small laboratory group increases the statistical reliability of the associations found and reduces the chance that the results are artifacts of a specific group of people.
The Mechanism: Why Processed Meats and Soft Drinks Affect the Brain Differently
The Virginia Tech study identified the association, but did not establish the exact mechanism by which processed meats and sugary drinks affect the brain more intensely than other ultra-processed foods. This is a limitation that the researchers themselves acknowledge — and one that opens the way for future research.
The hypotheses most consistent with existing scientific literature involve systemic inflammation and vascular dysfunction. Processed meats have high levels of sodium, nitrates, and nitrites — compounds that in high amounts are associated with inflammation and damage to blood vessels. The brain is the organ most dependent on adequate blood flow in the human body: any vascular impairment directly affects the delivery of oxygen and glucose to brain cells.
Sugary drinks promote rapid blood glucose spikes followed by a sharp drop — a pattern associated with insulin resistance over time. Brain cells depend on glucose as their primary fuel, and insulin resistance compromises this delivery. Previous studies had already linked insulin resistance to a higher risk of cognitive decline and Alzheimer’s, but the Virginia Tech study is one of the first to quantify the effect in a long-term longitudinal follow-up.
Ultra-processed Foods in Brazil: The Context That Makes the Study Locally Relevant
The consumption of ultra-processed foods in Brazil has grown consistently in recent decades. Research from IBGE and the Center for Epidemiological Research in Nutrition and Health at USP documents that ultra-processed foods already account for more than 20% of the calories consumed by Brazilians — with higher proportions among young adults and urban populations.
Processed meats like mortadella, sausage, ham, processed turkey breast, and linguiça are highly consumed foods in Brazil across all income brackets. They are cheap proteins, with good palatability, long shelf life, and easy preparation. Mortadella is the second most consumed processed meat in the country. Sausage appears at breakfast, as a snack, and as an ingredient in quick meals in homes across the socioeconomic spectrum.
Soft drinks and industrialized sugary beverages — boxed juices, powdered refreshments, and isotonic drinks — are equally widespread in consumption. Brazil is among the largest per capita consumers of soft drinks worldwide. The Brazilian consumption profile of processed meats and sugary drinks closely resembles the profile studied by Virginia Tech, which makes the associations found directly relevant to public health in the country.
What Researchers Recommend — and What the Study Doesn’t Say
Ben Katz and Brenda Davy were careful in communicating the study’s limitations. The association found is statistical — it does not mean that every consumer of processed meats will develop dementia, nor that no consumer of soft drinks will age with intact memory. It means that the risk is higher at a population level for those who have these habits than for those who do not.
The practical recommendation emerging from the study is not prohibition, but progressive substitution. Davy specifically mentioned that cooking at home and replacing soft drinks with water are the two habits with the greatest impact in reducing exposure to the identified risk categories. Cooking at home naturally reduces the consumption of processed meats because the cook tends to use fresh proteins, and replaces industrialized sugary drinks with water or self-prepared natural juices.
Lead researcher Katz summarized the expected practical impact: “Doctors should be able to take this back to their patients and say that food choices matter.” The phrase is modest, but what it represents is significant: seven years of data from tens of thousands of people transformed into a recommendation that any doctor can make in a routine consultation — without expensive tests, without medication, without technological intervention. Just the information that what goes on the plate today is shaping the brain that will remember, reason, and recognize people twenty or thirty years from now.
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