Landmark Study Links Ultra-Processed Foods to Elevated Risk of Chronic Disease and Death
A comprehensive new study published in the journal Family Medicine and Community Health has found that higher consumption of ultra-processed foods (UPFs) is associated with an increased risk of numerous adverse health outcomes, including heart disease, stroke, obesity, diabetes, depression, anxiety, digestive issues, and certain cancers. The research, which reviewed over 50 studies covering nearly 9 million adults worldwide over periods ranging from 2 to 32 years, provides the most robust evidence to date linking UPFs to serious health harms.
According to the findings, each additional 100 grams of ultra-processed food consumed daily was linked to a 14% higher risk of heart disease and an 11% higher risk of high blood pressure. The risk of cardiovascular disease, the leading cause of death in the United States, increased by 24% among those with higher UPF intake. Metabolic diseases also showed stark associations: diabetes risk rose by 24% and obesity risk by 23%. More than 100 million American adults are living with obesity, and the CDC estimates that the average American gets over half their daily calories from ultra-processed foods.
"Ultra-processed food is one of the major problems in public health," said Dr. Xiao Liu, lead author of the study and a physician at Sun Yat-Sen Memorial Hospital and research fellow at Duke-NUS Medical School, in an interview with ABC News.
What Are Ultra-Processed Foods and Why Are They Ubiquitous?
Ultra-processed foods are defined as products containing more than five ingredients, including at least one that is not typically found in a home kitchen—such as emulsifiers, additives, and artificial flavorings. Common examples include packaged snacks, processed meat products, cookies, cakes, sugary drinks, and many ready-to-eat meals. These foods are often engineered to be hyper-palatable, meaning they are designed to taste especially appealing, which can lead to overconsumption.
Dietitian Maya Feller explained the spectrum of processing to ABC News using an apple as an example: "You have a tree with apples, and the apples on the tree are in their whole form. You take the apple off the tree, and that is a step of processing. You slice the apple. That's another step of processing. You puree the apple. You haven't added anything to it. That's also processing." As more ingredients are added, the food becomes more processed, she noted.
The pervasiveness of UPFs in modern diets is a growing concern. In the UK, more than half of the calories consumed come from ultra-processed foods, according to BBC reporting. Dr. Chris van Tulleken, a physician and author who has extensively studied UPFs, told the BBC that these foods are "almost impossible to avoid"—even his own family's diet includes some.
The Debate Over Mechanisms
While the link between UPFs and poor health outcomes is well-established, scientists, doctors, and dietitians continue to debate the underlying reasons. Is the harm solely due to the high fat, sugar, salt, and calorie content of these foods? Or does the ultra-processing itself—the addition of emulsifiers, preservatives, and other industrial ingredients—play a distinct role? Some researchers suspect that additives may disrupt gut microbiota or trigger inflammation, but definitive answers remain elusive. The new study adds weight to the concern but does not resolve the mechanistic question.
Small Pilot Study Suggests Cutting UPFs May Improve Depression Symptoms
Adding to the growing body of research, a small pilot study from the University of California, San Francisco (UCSF) has found that reducing ultra-processed food intake may lead to significant improvements in depression symptoms. Published in JAMA Psychiatry and funded by the National Institutes of Health, the study involved just 20 participants with depression who were guided to cut their UPF consumption by more than 85% in favor of healthier choices.
According to a UCSF news release, participants experienced "moderate to large improvements across three measures of depression," and anxiety scores also improved modestly. "This study successfully established the viability of carrying out this research in a larger-scale trial," said senior author Dr. Andrew Krystal, a professor in UCSF's departments of Psychiatry and Behavioral Sciences and Neurology. The university plans to enroll participants in a much larger follow-up study in 2028.
While the study was small and cannot establish causation, it aligns with previous observational research linking UPFs to mental health problems. The findings offer a ray of hope: unlike many risk factors for depression, diet is modifiable. If larger trials confirm the results, dietary interventions could become a valuable tool in mental health treatment.
Context: A Growing Public Health Crisis and Shifting Dietary Guidelines
The new research arrives amid heightened public and policy attention to ultra-processed foods. In the United States, the federal government's latest dietary guidelines have attempted to address UPFs, though the recommendations have been met with mixed reviews. As Deseret News previously reported, the guidelines kept red meat and dairy in, removed saturated fats from the "naughty list" (while still advising limiting them to at most 10% of daily calories), and offered somewhat vague advice on grains. Critics argue that the guidelines fail to sufficiently warn against UPFs.
Globally, the conversation is intensifying. In the UK, the BBC recently explored whether it's possible to eat UPFs and still be healthy, with a dietitian analyzing a reporter's weekly shopping list. The conclusion: while some processed foods can be part of a balanced diet, the sheer prevalence of UPFs makes them hard to avoid, and their health risks are cumulative.
The stakes are enormous. Cardiovascular disease remains the leading cause of death worldwide. Diabetes and obesity rates continue to climb, straining healthcare systems. Mental health disorders, including depression and anxiety, affect hundreds of millions globally. If UPFs contribute even modestly to these conditions, the population-level impact is staggering.
The Food Industry Under Scrutiny
As evidence mounts, the food industry faces increasing pressure. Some manufacturers have begun reformulating products to reduce additives or improve nutritional profiles, but critics argue that these efforts are often cosmetic. The term "ultra-processed" itself has become a marketing battleground, with some companies attempting to distance their products from the label while others embrace "clean label" trends.
Regulatory approaches vary. Some countries, like Chile and Mexico, have implemented front-of-package warning labels for high-sugar, high-salt, and high-fat foods. Others, including the US and UK, rely more on voluntary guidelines and public education. The new study may fuel calls for stricter regulation, particularly as the link between UPFs and depression adds a new dimension to the debate.
Perspective: What This Means for Consumers, Policymakers, and the Future of Food
The latest findings underscore a simple but powerful message: what we eat matters profoundly for both physical and mental health. For consumers, the advice is not to panic but to prioritize whole and minimally processed foods when possible. As dietitian Maya Feller emphasized, not all processing is equal—slicing an apple or pureeing vegetables is not the same as manufacturing a shelf-stable snack cake with 20 ingredients.
Practical steps include reading ingredient lists, cooking more meals at home, and choosing whole grains, fruits, vegetables, and lean proteins. However, experts acknowledge that structural barriers—such as cost, convenience, and food deserts—make it difficult for many to avoid UPFs entirely. Addressing these inequities will require policy changes, not just individual willpower.
For policymakers, the research adds urgency to efforts to improve food environments. Potential measures include subsidizing healthy foods, restricting marketing of UPFs to children, and mandating clearer labeling. The upcoming larger trial on UPFs and depression, planned for 2028, could provide even more compelling evidence to drive action.
For the food industry, the writing may be on the wall. Companies that innovate toward healthier, minimally processed products could gain a competitive edge as consumers become more health-conscious. Those that resist may face regulatory and reputational risks.
In the end, the debate over ultra-processed foods is not just about nutrition—it's about the food system we've built and whether it supports human health or undermines it. The new studies add weight to the scale favoring change. As Dr. Xiao Liu put it, UPFs are "one of the major problems in public health." Recognizing that is the first step toward solving it.
The Road Ahead
While the evidence is not yet definitive enough to say that UPFs cause chronic diseases, the consistency of findings across diverse populations and study designs is striking. The precautionary principle suggests that reducing UPF consumption is prudent, especially given the lack of benefit. Future research will likely focus on identifying which specific additives or processing methods are most harmful, and on developing interventions that are feasible for real-world populations.
For now, the message is clear: cutting back on ultra-processed foods may be one of the most impactful dietary changes a person can make. And for those struggling with depression, it might even offer a measure of relief. As the UCSF study suggests, the potential for dietary interventions to improve mental health is a promising avenue that deserves rigorous exploration.
In a world where UPFs are ubiquitous and heavily marketed, making healthier choices is not always easy. But with growing awareness and accumulating scientific evidence, the tide may be turning. The question is whether policy, industry, and individuals can move fast enough to reverse the tide of diet-related disease.
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