Does eating ultra-processed foods really raise your cancer risk?
Yes, and the evidence is consistent across multiple large-scale studies. A 2023 systematic review and meta-analysis that combined data from 11 studies found that for every 10% increase in the proportion of ultra-processed foods in your diet, your risk of developing any cancer rises by 13% (hazard ratio 1.13) [1]. This means if your diet goes from 20% UPFs to 30%, your overall cancer risk increases by about 13% — a meaningful jump. The same review found even stronger links for colorectal cancer (30% higher risk for high vs. low intake) and pancreatic cancer (49% higher risk) [1].
A separate large UK Biobank study of nearly 200,000 adults tracked people for about 10 years and found that every 10 percentage point increase in UPF consumption was linked to a 2% higher risk of developing any cancer (hazard ratio 1.02) and a 6% higher risk of dying from cancer (hazard ratio 1.06) [3]. While 2% sounds small, it translates to thousands of extra cancer cases across a population. This study also found a striking 19% higher risk of ovarian cancer and a 30% higher risk of dying from ovarian cancer for the same 10% increase in UPFs [3].
Which specific cancers are most strongly linked to ultra-processed foods?
The strongest and most consistent links are for colorectal, breast, and pancreatic cancers. The meta-analysis found that high UPF intake was associated with a 30% higher risk of colorectal cancer and a 49% higher risk of pancreatic cancer [1]. A large Spanish case-control study (over 1,800 colorectal cancer cases) confirmed that a 10% increase in UPF consumption raised colorectal cancer risk by 11% [5]. For pancreatic cancer, a separate U.S. trial of nearly 100,000 people found that those with the highest UPF intake had a 49% higher risk compared to those with the lowest intake, and the risk increased in a straight-line, dose-response manner — meaning the more UPFs you eat, the higher your risk [4].
Breast cancer also shows a clear link. The meta-analysis reported an 11% higher risk of breast cancer for every 10% increase in UPFs [1], and the UK Biobank study found a 16% higher risk of dying from breast cancer [3]. Ovarian cancer stood out in the UK study with a 19% higher risk of developing it and a 30% higher risk of dying from it [3]. Notably, prostate cancer showed no consistent association across studies [1][5], suggesting that not all cancers are equally affected.
Is the increased cancer risk large enough to worry about?
Yes, the risk increases are clinically meaningful, especially for people with high UPF intake. The average person in the UK Biobank study got about 23% of their diet from UPFs [3]. If someone increased that to 33% — still a common level in many Western diets — their overall cancer risk would rise by about 2% (from the UK study) to 13% (from the meta-analysis) [1][3]. For ovarian cancer, the same increase would raise risk by 19% [3]. These are not trivial numbers: a 19% increase in ovarian cancer risk is comparable to the risk increase from being overweight or having a family history for some cancers.
The evidence also shows that the effect is dose-dependent — the more UPFs you eat, the higher your risk. The pancreatic cancer study found a clear linear trend: risk increased steadily with each quartile of UPF intake [4]. And the multinational EPIC study of over 266,000 people found that higher UPF consumption increased the risk of developing multiple chronic diseases together (cancer plus heart disease or diabetes) by 9% per standard deviation increase (about 260 grams per day) [2]. This means UPFs don't just raise cancer risk in isolation — they contribute to a broader pattern of poor health.
About These Sources
This answer is built on 5 peer-reviewed studies — published from 2021 to 2023, 4 in Q1 journals, collectively cited 561 times — selected as the most relevant from 5 studies that passed quality screening, drawn from 26 papers retrieved from a database of over 500 million.
Sources used in this answer
Ultra-processed food consumption and cancer risk: A systematic review and meta-analysis
A systematic review and meta-analysis of 11 studies found that a 10% increase in UPF intake was associated with a 13% higher risk of overall cancer, 11% higher risk of breast cancer, 30% higher risk of colorectal cancer, and 49% higher risk of pancreatic cancer.
Consumption of ultra-processed foods and risk of multimorbidity of cancer and cardiometabolic diseases: a multinational cohort study
A prospective cohort study of 266,666 Europeans found that higher UPF consumption (per ~260 g/day increase) was associated with a 9% higher risk of developing multimorbidity (cancer plus cardiometabolic disease), with strongest links for animal-based products and sugary drinks.
Ultra-processed food consumption, cancer risk and cancer mortality: a large-scale prospective analysis within the UK Biobank
A UK Biobank study of 197,426 adults found that every 10 percentage point increase in UPF intake was linked to a 2% higher overall cancer incidence, 6% higher cancer mortality, and notably a 19% higher ovarian cancer incidence and 30% higher ovarian cancer mortality.
Ultra‐processed food consumption and the risk of pancreatic cancer in the Prostate, Lung, Colorectal and Ovarian Cancer Screening Trial
A prospective study of 98,265 U.S. adults found that high UPF consumption was associated with a 49% higher risk of pancreatic cancer, with a linear dose-response relationship, and a stronger effect in adults under 65 years old.
Consumption of ultra-processed foods and drinks and colorectal, breast, and prostate cancer
A large Spanish case-control study found that a 10% increase in UPF consumption was associated with an 11% higher risk of colorectal cancer, but no significant association with breast or prostate cancer.