Are ultra-processed foods a public health hazard?
Yes — Growing Scientific Consensus Says They Are a Public Health Hazard
The evidence base has become substantial enough that major health authorities are now calling for urgent policy action, though the picture is nuanced.
The Strongest Recent Evidence
In November 2025, a three-paper Series in The Lancet, written by 43 international experts, warned that the rapid spread of ultra-processed foods (UPFs) across global diets is creating a serious public health challenge. Critically, the authors explain that although more research on UPFs will continue to be valuable, the current science is already strong enough to justify immediate public health action, and waiting for further studies would allow UPFs to gain an even stronger hold in global diets.
As NPR summarized the findings: the papers reviewed more than a hundred studies which have linked ultraprocessed foods to poor health outcomes, including an increased risk of Type 2 diabetes, obesity, chronic kidney and heart disease, even depression. Dozens of scientists reviewed this research, and they say there's enough evidence now to say that ultraprocessed foods are a major problem.
The Scale of the Risk
A major umbrella review of 45 meta-analyses covering nearly 10 million people found consistent evidence that higher exposure to ultra-processed foods is associated with an increased risk of 32 damaging health outcomes including cancer, major heart and lung conditions, mental health disorders, and early death. Specifically, compelling evidence showed that higher intakes of ultra-processed foods were associated with a 50% increased risk of cardiovascular disease-related death, plus a 48–53% increased risk of anxiety and common mental disorders, and a 12% increased risk of type 2 diabetes.
A separate 2025 systematic review of 41 cohort studies involving over 8 million adults found that each additional 100 g/day of ultra-processed food consumption was associated with a 14.5% higher risk of hypertension, 5.9% increased risk of cardiovascular events, 1.2% increased risk of cancer, 19.5% higher risk of digestive diseases and 2.6% higher risk of all-cause mortality.
Moving Beyond Association to Causation
A key development in 2025 is evidence moving beyond correlation. A 2025 randomized controlled trial has shown the harmful effects of UPFs on weight gain and metabolic and reproductive health, regardless of excessive caloric intake. This matters because it suggests something about the processing itself—not just calories, sugar, or salt—may independently drive harm.
Researchers are also uncovering plausible mechanisms. In an experimental study on mice, two widely consumed food additive emulsifiers caused transgenerational microbiota alteration that led to increased long-term susceptibility to metabolic and inflammatory diseases. And a large French cohort study revealed positive associations between exposure to two widely consumed food additive mixtures and higher type 2 diabetes mellitus incidence.
The Scale of Exposure
This isn't a niche issue—UPFs dominate modern diets. They can account for up to 58% of total daily energy intake in some high income countries, and have rapidly increased in many low and middle income nations in recent decades. In the U.S. specifically, the average American gets over half their daily calories from ultra-processed foods.
Important Caveats
Despite the strong associations, scientists are careful about causality language. One review paper notes: while association studies cannot account for all potential confounding factors, triangulation through combining large-scale cohort studies with animal/in vitro models and human challenge studies provides more compelling evidence that UPFs increase the risks of NCDs. Earlier meta-analyses graded much of the evidence as only "low" to "moderate" quality by strict standards (e.g., the quality of evidence for the association between consumption of UPF and the incidence of diabetes was moderate, and the quality of evidence for hypertension, hypertriglyceridemia, low HDL cholesterol concentration, and obesity was low), reflecting the inherent difficulty of nutrition epidemiology.
There's also debate about why UPFs are harmful—whether it's primarily their poor nutrient profile (high sugar/salt/fat, low fiber) or something intrinsic to industrial processing and additives. These products can compromise nutritional quality while promoting hedonistic hunger and disrupting the gut microbiota, suggesting multiple overlapping mechanisms.
Bottom Line
The weight of evidence—spanning large cohort studies, systematic reviews, emerging RCTs, and mechanistic research—has pushed mainstream science and institutions like The Lancet toward treating UPFs as a genuine public health hazard warranting policy intervention, not just an individual dietary choice. While debate continues over precise mechanisms and the quality of some underlying evidence, the consistency and scale of associated harms across cardiovascular disease, cancer, diabetes, mental health, and mortality have been enough to prompt calls for urgent regulatory action from major scientific bodies.
Citations (15)
- Global surge in ultra-processed foods sparks urgent health warning
Source excerpt: “**Rising UPF Consumption Sparks Global Health Concerns** A new three paper Series in *The Lancet*, written by 43 international experts, warns that th...”
evidence, article, points to yes. Claim: A three-paper Lancet Series by 43 experts warns that the spread of ultra-processed foods creates a serious public health challenge.
- Global surge in ultra-processed foods sparks urgent health warning
Source excerpt: “- The authors explain that although more research on UPFs will continue to be valuable, the current science is already strong enough to justify immedi...”
evidence, article, points to yes. Claim: Authors say current science is strong enough to justify immediate public health action without waiting for more studies.
- ultra processed foods are a threat to public health scientists say
Source excerpt: “There are three papers, they're published in The Lancet, and they reviewed years' worth of evidence, more than a hundred studies which have linked ult...”
evidence, article, points to yes. Claim: Lancet papers reviewed over a hundred studies linking ultraprocessed foods to poor health outcomes such as diabetes, obesity, kidney and heart disease, depression.
- ultra processed foods are a threat to public health scientists say
Source excerpt: “Dozens of scientists reviewed this research, and they say there's enough evidence now to say that ultraprocessed foods are a major problem. ”
attribution, article, points to yes. Claim: Dozens of scientists reviewed the research and say there is enough evidence that ultraprocessed foods are a major problem.
- Consistent evidence links ultra-processed food to over 30 damaging health outcomes - BMJ Group
Source excerpt: “Findings underscore need for urgent research to understand how ultra-processed foods affect health and measures to target and reduce exposure Consiste...”
evidence, article, points to yes. Claim: An umbrella review of 45 meta-analyses found higher UPF exposure associated with increased risk of 32 damaging health outcomes.
- takecontrol.substack.com
Source excerpt: “Compelling evidence showed that higher intakes of ultra-processed foods were associated with a 50% increased risk of cardiovascular disease-related de...”
statistic, article, points to yes. Claim: Higher UPF intake associated with 50% higher CVD death risk, 48-53% higher anxiety/common mental disorder risk, 12% higher type 2 diabetes risk.
- Ultra-Processed Foods May Be Associated With Adverse Health Outcomes - American College of Cardiology
Source excerpt: “Each additional 100 g/day of ultra-processed food consumption was associated with a 14.5% higher risk of hypertension, 5.9% increased risk of cardiova...”
statistic, article, points to yes. Claim: Each additional 100 g/day of UPF linked to higher risks of hypertension, cardiovascular events, cancer, digestive disease and all-cause mortality.
- Health effects of ultra-processed food: uncovering causal mechanisms
Source excerpt: “## Key advances - A 2025 randomized controlled trial has shown the harmful effects of UPFs on weight gain and metabolic and reproductive health, regar...”
evidence, reference entry, points to yes. Claim: A 2025 randomized controlled trial showed harmful effects of UPFs on weight gain and metabolic and reproductive health regardless of calories.
- Health effects of ultra-processed food: uncovering causal mechanisms
Source excerpt: “In an experimental study on mice, two widely consumed food additive emulsifiers caused transgenerational microbiota alteration that led to increased l...”
evidence, reference entry, points to yes. Claim: Mouse study found two food additive emulsifiers caused transgenerational microbiota alteration and increased susceptibility to metabolic and inflammatory diseases.
- Health effects of ultra-processed food: uncovering causal mechanisms
Source excerpt: “A large prospective cohort study revealed positive associations between exposure to two widely consumed food additive mixtures and higher type 2 diabe...”
evidence, reference entry, points to yes. Claim: Large French cohort linked two additive mixtures to higher type 2 diabetes incidence.
- Consistent evidence links ultra-processed food to over 30 damaging health outcomes - BMJ Group
Source excerpt: “They can account for up to 58% of total daily energy intake in some high income countries, and have rapidly increased in many low and middle income na...”
statistic, article, points to yes. Claim: UPFs can account for up to 58% of daily energy intake in some high-income countries and are rising in low- and middle-income nations.
- Eating more ultra-processed foods linked to worse health, study finds - ABC News
Source excerpt: “The agency also found that the average American gets over half their daily calories from ultra-processed foods. ”
statistic, article, points to yes. Claim: The average American gets over half their daily calories from ultra-processed foods.
- Why is there no regulation despite evidence that ultra-processed foods are hazardous to long-term health? - ScienceDirect
Source excerpt: “While association studies cannot account for all potential confounding factors, triangulation through combining large-scale cohort studies with animal...”
evidence, article, neutral. Claim: Association studies cannot account for all confounders; triangulating cohort, animal/in vitro and human challenge studies gives more compelling evidence.
- Ultra-Processed Foods and Human Health: A Systematic Review and Meta-Analysis of Prospective Cohort Studies - PMC
Source excerpt: “According to the NutriGrade scoring system, the quality of evidence for the association between consumption of UPF and the incidence of diabetes was m...”
evidence, article, neutral. Claim: Earlier meta-analyses graded evidence quality for diabetes as moderate and for hypertension, lipids and obesity as low.
- Why is there no regulation despite evidence that ultra-processed foods are hazardous to long-term health? - ScienceDirect
Source excerpt: “These products can compromise nutritional quality while promoting hedonistic hunger and disrupting the gut microbiota. ”
evidence, article, points to yes. Claim: UPFs can compromise nutritional quality while promoting hedonistic hunger and disrupting the gut microbiota.