Are ultra-processed foods a public health hazard?
Yes — the evidence increasingly supports that ultra-processed foods (UPFs) are a genuine public health hazard, though scientists are still working out exactly why.
What the evidence shows
Strong observational associations with chronic disease. A large body of prospective cohort research consistently links UPF consumption to poor health outcomes. A scoping review for the Nordic Nutrition Recommendations found that greater consumption of UPFs is associated with weight gain and increased risk of obesity, cardiovascular disease, type 2 diabetes, and all-cause mortality, with additional but less certain links to hypertension, cancer, and depression. A meta-analysis of prospective cohorts similarly found a consistently positive association between high UPF intake and increased risk of developing diabetes (37%), hypertension (32%), hypertriglyceridemia (47%), low HDL cholesterol concentration (43%), and obesity (32%).
Mortality risk appears dose-dependent. Tufts University researchers found that for every 10% increase in calories from ultra-processed foods, mortality risk rose by 9%. Practically, someone who gets 60% of their calories from these products... has a 27% greater chance of dying of all causes compared to someone who limits these foods to 30% of their diet. Interestingly, not all UPFs are equal — ultra-processed whole grain breads and cereals were associated with neither positive nor negative impacts on health, and ultra-processed vegetables and legumes were associated with a reduced likelihood of death.
Emerging risks beyond metabolic disease. Newer research has expanded the list of concerns to include kidney disease — a meta-analysis found higher UPF intake was significantly associated with increased CKD risk (pooled log-hazard ratio = 0.17; 95% CI: 0.07–0.28; p < 0.001) — as well as links to cognitive decline, stroke, and even early signs of Parkinson's disease in observational studies.
2025 was a turning point for causal evidence. Until recently, most evidence was correlational. That changed with new experimental work: 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. Mechanistic studies are also emerging — for example, an experimental study on mice found that two widely consumed food additive emulsifiers caused transgenerational microbiota alteration that led to increased long-term susceptibility to metabolic and inflammatory diseases. This matters because the harmful effects of ultra-processed food cannot be entirely attributed to its poor nutritional quality alone — additives, food structure, and texture appear to play independent roles.
Scale of the problem. This isn't a fringe issue — UPF consumption is rising, accounting now for more than half of the daily calories of US, Canadian, or British diets, and consumption is also climbing rapidly in lower-income countries, raising concerns about a widening global burden of chronic disease.
The scientific consensus is strengthening, but with caveats
In late 2025, over 40 leading researchers published a major series in The Lancet concluding that UPF are a leading contributor to chronic disease, and specifically that the widespread sale and consumption of UPF creates large corporate profits while making people sick.
That said, researchers urge some caution: the risk estimates varied significantly depending on the methodology used to assess UPF consumption, with a difference of more than 50% between the methods, and one review noted that further large-scale, high-quality prospective cohort studies, intervention studies and experimental studies are needed... to provide a safe recommended daily intake (RDI) of UPFs in the future. Scientists are also debating whether policy should target all UPFs uniformly or focus on specific harmful subcategories, since — as seen with whole-grain products and vegetables — not every ultra-processed food behaves the same way metabolically.
Bottom line
The weight of evidence — spanning large cohort studies, systematic reviews, and now randomized controlled trials — supports treating high UPF consumption as a significant public health concern linked to obesity, diabetes, cardiovascular disease, kidney disease, and premature death. While the field is still refining which aspects of UPFs (additives, texture, energy density, or the food matrix itself) drive these harms, the overall pattern is consistent enough that major public health bodies and leading journals like The Lancet are now calling for stronger policy responses.
Citations (16)
- Ultra-processed foods – a scoping review for Nordic Nutrition Recommendations 2023
Source excerpt: “The current evidence supports that greater consumption of UPFs is associated with weight gain and increased risk of obesity, cardiovascular disease, t...”
evidence, article, points to yes. Claim: Greater UPF consumption is associated with weight gain and higher risk of obesity, cardiovascular disease, type 2 diabetes, and all-cause mortality.
- Ultra-processed foods – a scoping review for Nordic Nutrition Recommendations 2023
Source excerpt: “The available literature also supports an association between UPFs and hypertension, cancer, and depression; however, the limited number of studies an...”
evidence, article, points to yes. Claim: Additional but less certain links exist between UPFs and hypertension, cancer, and depression.
- 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 ...”
statistic, article, points to yes. Claim: High UPF intake associated with increased risk of diabetes (37%), hypertension (32%), hypertriglyceridemia (47%), low HDL (43%), and obesity (32%).
- Ultra-processed Foods and Your Health Risks | Tufts Solutions
Source excerpt: “Eating more ready-to-eat meals, sugary drinks, and packaged snacks is linked to higher death rates, Tufts researchers find Researchers at the Friedma...”
statistic, article, points to yes. Claim: Tufts researchers found each 10% increase in calories from UPFs raised mortality risk by 9%.
- Ultra-processed Foods and Your Health Risks | Tufts Solutions
Source excerpt: “This means that someone who gets 60% of their calories from these products—which are often packed with added sugars, salt, and carbohydrates, and ofte...”
statistic, article, points to yes. Claim: Getting 60% of calories from UPFs means 27% greater chance of death versus 30% of diet.
- Ultra-processed Foods and Your Health Risks | Tufts Solutions
Source excerpt: “The exceptions were ultra-processed whole grain breads and cereals, which were associated with neither positive nor negative impacts on health, and ul...”
evidence, article, neutral. Claim: Ultra-processed whole grain breads and cereals showed neither positive nor negative health impacts; vegetables and legumes were associated with reduced mortality.
- Ultra-Processed Food and Chronic Kidney Disease Risk: A Systematic Review, Meta-Analysis, and Recommendations
Source excerpt: “Using a random-effects model, higher UPF intake was significantly associated with increased CKD risk (pooled log-hazard ratio = 0.17; 95% CI: 0.07–0.2...”
statistic, article, points to yes. Claim: Higher UPF intake was significantly associated with increased chronic kidney disease risk in a meta-analysis.
- 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...”
evidence, article, points to yes. Claim: A 2025 randomized controlled trial showed harmful effects of UPFs on weight gain and metabolic and reproductive health.
- 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...”
evidence, article, points to yes. Claim: Mouse study found two emulsifiers caused transgenerational microbiota alteration and increased susceptibility to metabolic and inflammatory diseases.
- Ultra-processed Foods and Your Health Risks | Tufts Solutions
Source excerpt: “The study provides evidence that the harmful effects of ultra-processed food cannot be entirely attributed to its poor nutritional quality, but more r...”
evidence, article, points to yes. Claim: Harmful effects of UPFs cannot be entirely attributed to poor nutritional quality; additives and structure may play roles.
- Ultra-Processed Food Consumption and Incidence of Obesity and Cardiometabolic Risk Factors in Adults: A Systematic Review of Prospective Studies
Source excerpt: “Several studies reported that UPF consumption is rising, accounting now for more than half of the daily calories of US [[2583]], Canadian [[2583]], or...”
statistic, article, points to yes. Claim: UPFs account for more than half of daily calories in US, Canadian, and British diets, and consumption is rising.
- Harms of Ultra-Processed Foods: New Research Insights
Source excerpt: “They conclude that UPF are a leading contributor to chronic disease. ”
attribution, article, points to yes. Claim: Lancet series by over 40 researchers concluded UPFs are a leading contributor to chronic disease.
- Harms of Ultra-Processed Foods: New Research Insights
Source excerpt: “The widespread sale and consumption of UPF creates large corporate profits while making people sick. ”
attribution, article, points to yes. Claim: Researchers said widespread UPF sale and consumption creates large corporate profits while making people sick.
- Ultra-Processed Foods and Human Health: A Systematic Review and Meta-Analysis of Prospective Cohort Studies
Source excerpt: “However, these risks varied significantly depending on the methodology used to assess UPF consumption, with a difference of more than 50% between the ...”
evidence, article, neutral. Claim: Risk estimates varied significantly by methodology used to assess UPF consumption, differing by more than 50%.
- Ultra-Processed Foods and Human Health: A Systematic Review and Meta-Analysis of Prospective Cohort Studies
Source excerpt: “These findings show that UPF consumption is associated with higher risk of diabetes, hypertension, dyslipidemia, and obesity, but the level of risk co...”
evidence, article, points to yes. Claim: UPF consumption is associated with higher risk of diabetes, hypertension, dyslipidemia, and obesity, though risk level varies.
- Ultra-processed foods and human health: An umbrella review and updated meta-analyses of observational evidence - ScienceDirect
Source excerpt: “Further large-scale, high-quality prospective cohort studies, intervention studies and experimental studies are needed to confirm our findings, allow ...”
evidence, article, neutral. Claim: Further large-scale, high-quality cohort, intervention, and experimental studies are needed to confirm findings and set safe intake.