Are ultra-processed foods a public health hazard?
Are Ultra-Processed Foods a Public Health Hazard?
Based on a substantial and rapidly growing body of scientific evidence, the answer from most public health experts and major research institutions is yes — with some important nuances.
The Case That They Are a Hazard
Massive scale of consumption: Ultra-processed foods account for 17% to 56% (mean of 37%) of total daily energy intake across 28 countries, and global UPF sales grew from $1.5 trillion in 2009 to $1.9 trillion in 2023.
Strong epidemiological evidence: A major recent umbrella review found that examined ultra-processed food exposure and adverse health outcomes across epidemiological meta-analyses, published in the BMJ in 2024. More specifically, a comprehensive 2026 meta-analysis of 51 prospective cohort studies involving more than 8 million people found that higher consumption of ultra-processed foods was associated with multiple chronic health risks, with a majority of the pooled studies associating higher UPF consumption with cardiovascular events, cancer events, digestive diseases, obesity and overweight conditions, all-cause mortality and depression and anxiety.
A 2025 systematic review cited in the Lancet series found that of 104 long-term studies, 92 showed higher risks for at least one chronic disease, with meta-analyses identifying significant associations with 12 health conditions including obesity, type 2 diabetes, cardiovascular disease, depression, and premature death.
Specific health outcomes linked to UPF consumption:
Emerging causal mechanisms: Beyond correlational data, experimental research is now uncovering why UPFs harm health. 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. Animal studies show an experimental study on mice found two widely consumed food additive emulsifiers caused transgenerational microbiota alteration that led to increased long-term susceptibility to metabolic and inflammatory diseases. Research also suggests our bodies absorb more calories from UPFs than foods that have been minimally processed, which over time can increase the risk of inflammatory bowel diseases, insulin resistance, and other health issues.
Growing Policy Response
The evidence has moved beyond academic debate into government action. In 2025, HHS, FDA, and USDA announced they are accelerating federal efforts to address growing concerns around ultra-processed foods, launching a joint Request for Information to establish a federally recognized uniform definition. Meanwhile, California voted in June 2025 to enact the first U.S. law to define and ban unhealthy ultra-processed foods from school meals, and taxes and policy changes like soda taxes have been shown to decrease intake.
The American Heart Association's 2025 Science Advisory called for multilevel strategies, including more research on how UPFs impact the body, refining dietary guidance, and evidence-based policies to regulate food additives. Experts writing in the Lancet series argue that although more research on UPFs will continue to be valuable, the current science is already strong enough to justify immediate public health action, stressing that real progress requires coordinated policies that limit UPF production, marketing, and availability, while also addressing high levels of fat, sugar and salt and expanding access to healthy food.
Important Caveats and Nuance
The picture isn't entirely black-and-white:
Bottom Line
The consensus among major medical and public health bodies — including the Lancet's 2025 expert series, the American Heart Association, and U.S. federal agencies — is that ultra-processed foods, as a category, pose genuine and significant public health risks, particularly given how dominant they've become in modern diets. The evidence connects heavy UPF consumption to obesity, type 2 diabetes, cardiovascular disease, certain cancers, depression, and premature death. However, experts increasingly emphasize that not all UPFs carry equal risk, and there's a need for better classification systems that distinguish nutrient-poor "junk" UPFs from more nutritionally beneficial processed products. The direction of travel — more research, new regulations, and shifting dietary guidelines — reflects that policymakers are treating this as a serious and urgent public health issue.
Citations (26)
- Ultra-Processed Food Consumption and Mental Health: A Systematic Review and Meta-Analysis of Observational Studies
Source excerpt: “Indeed, at the beginning of 2021, we published a systematic review and meta-analysis that showed ultra-processed foods accounted for 17% to 56% (mean ...”
- Harms of Ultra-Processed Foods: New Research Insights
Source excerpt: “Global UPF sales grew from $1.5 trillion in 2009 to $1.9 trillion in 2023. ”
- Ultra-processed foods and cardiometabolic risk: from evidence to policy | npj Metabolic Health and Disease
Source excerpt: “... Lane, M. M. et al. Ultra-processed food exposure and adverse health outcomes: umbrella review of epidemiological meta-analyses. BMJ 384, e077310 (...”
- UPF meta-analysis lands as industry debates definitions
Source excerpt: “A majority of the pooled meta-analysis studies associate higher UPF consumption with cardiovascular events, cancer events, digestive diseases, obesity...”
- Global surge in ultra-processed foods sparks urgent health warning | ScienceDaily
Source excerpt: “A systematic review of 104 long-term studies found that 92 showed higher risks for at least one chronic disease, with meta-analyses identifying signif...”
- Ultra-Processed Foods and Human Health: A Systematic Review and Meta-Analysis of Prospective Cohort Studies - ScienceDirect
Source excerpt: “The results of our meta-analysis show that total UPF consumption is associated with higher risk of diabetes, hypertension, dyslipidemia, and obesity. ”
- Ultra-Processed Foods and Human Health: A Systematic Review and Meta-Analysis of Prospective Cohort Studies
Source excerpt: “A consistently positive association between high UPF intake and increased risk of developing diabetes (37%), hypertension (32%), hypertriglyceridemia ...”
- Consumption of ultra-processed foods and health status: a systematic review and meta-analysis
Source excerpt: “For prospective cohort studies evaluating a total population of 183 491 participants followed for a period ranging from 3·5 to 19 years, highest UPF c...”
- Ultra-Processed Food Consumption and Mental Health: A Systematic Review and Meta-Analysis of Observational Studies
Source excerpt: “Greater ultra-processed food consumption was cross-sectionally associated with increased odds of depressive and anxiety symptoms, both when these outc...”
- Ultra-Processed Food Consumption and Mental Health: A Systematic Review and Meta-Analysis of Observational Studies
Source excerpt: “Furthermore, a meta-analysis of prospective studies demonstrated that greater ultra-processed food intake was associated with increased risk of subseq...”
- Harms of Ultra-Processed Foods: New Research Insights
Source excerpt: “Chan School of Public Health and relies on a robust data set representing nearly 30,000 nurses. ”
- Harms of Ultra-Processed Foods: New Research Insights
Source excerpt: “The study’s findings add to a host of health problems already associated with UPF, including Type 2 diabetes, depression, and heart, kidney, and gastr...”
- Health effects of ultra-processed food: uncovering causal mechanisms | Nature Reviews Endocrinology
Source excerpt: “A 2025 randomized controlled trial has shown the harmful effects of UPFs on weight gain and metabolic and reproductive health, regardless of excessive...”
- Health effects of ultra-processed food: uncovering causal mechanisms | Nature Reviews Endocrinology
Source excerpt: “In an experimental study on mice, two widely consumed food additive emulsifiers caused transgenerational microbiota alteration that led to increased l...”
- What Are Ultra-Processed Foods? | Johns Hopkins | Bloomberg School of Public Health
Source excerpt: “Some research has shown that our bodies absorb more calories from UPFs than foods that have been minimally processed. ”
- What Are Ultra-Processed Foods? | Johns Hopkins | Bloomberg School of Public Health
Source excerpt: “Over time, this can increase the risk of inflammatory bowel diseases, insulin resistance, and other health issues. ”
- HHS, FDA and USDA Address the Health Risks of Ultra-Processed Foods | USDA
Source excerpt: “(Washington, D.C., July 23, 2025) – Under the leadership of the U.S. Department of Health and Human Services Secretary Robert F. Kennedy, Jr. and the ...”
- What Are Ultra-Processed Foods? | Johns Hopkins | Bloomberg School of Public Health
Source excerpt: “In June, California voted to enact the first U.S. law to define and ban unhealthy ultra-processed foods from an estimated over 1 billion meals served ...”
- What Are Ultra-Processed Foods? | Johns Hopkins | Bloomberg School of Public Health
Source excerpt: “Taxes and policy changes are viable options. Many countries, and some U.S. communities, now have soda taxes that decrease intake, for example. ”
- Excessive ultraprocessed foods (UPFs) and poor nutrition tied to poor health | American Heart Association
Source excerpt: “Experts recommend multilevel strategies, including more research to uncover how UPFs specifically impact the body, refining dietary guidance to discou...”
- Global surge in ultra-processed foods sparks urgent health warning | ScienceDaily
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 immediat...”
- Global surge in ultra-processed foods sparks urgent health warning | ScienceDaily
Source excerpt: “Real progress requires coordinated policies that limit UPF production, marketing, and availability, while also addressing high levels of fat, sugar an...”
- Ultra-Processed Foods and Human Health: A Systematic Review and Meta-Analysis of Prospective Cohort Studies - ScienceDirect
Source excerpt: “These data have several limitations due to the meta-evidence of low quality and the fact that the level of risk consistently changes depending on the ...”
- What Are Ultra-Processed Foods? | Johns Hopkins | Bloomberg School of Public Health
Source excerpt: “Prepackaged whole grain breads, many yogurts, instant oatmeal, and jarred pasta sauces are all ultra-processed foods, but have lower levels of saturat...”
- What Are Ultra-Processed Foods? | Johns Hopkins | Bloomberg School of Public Health
Source excerpt: “Baked beans, which contain protein, fiber, and minerals like iron and potassium, are ultra-processed, but consumption of beans has been shown to suppo...”
- Why is there no regulation despite evidence that ultra-processed foods are hazardous to long-term health? - PMC
Source excerpt: “In summary, UPFs are inexpensive, shelf-stable products that exacerbate poor nutrition and risks of NCDs by displacing nutrient-rich foods.50 This is ...”