- A US study found men who ate more ultra-processed foods had a higher risk of prostate cancer.
- The increased risk remained after researchers adjusted for age, ethnicity, smoking and poverty status.
- The study cannot prove cause and effect, but it adds to wider concerns about ultra-processed diets, inflammation and metabolic health.
Ultra-processed foods are no longer just a weight story.
A new study has linked higher intake of ultra-processed foods with a greater risk of prostate cancer in men.
Researchers analysed data from 17,024 US men who took part in the National Health and Nutrition Examination Survey between 2003 and 2023.
They used dietary recalls to estimate how much of each person’s daily energy intake came from ultra-processed foods.
These include products such as soft drinks, packaged cereals, processed snacks, processed meats and many ready-made foods.
They are usually manufactured with refined starches, oils, sugars, salt and additives designed to improve texture, flavour and shelf life.
- Ultra-processed foods may affect focus even in people with healthy diets
- Ultra processed foods may raise asthma risk in children
- Ultra-processed food intake linked to poorer thigh muscle quality
The men were divided into four groups, from less than about 20% of calories from ultra-processed foods to more than 44%.
Compared with men in the lowest group, those in the higher-consumption groups had a higher risk of prostate cancer.
The three higher-consumption groups had a 29% greater risk.
The two highest-consumption groups had a 30% greater risk.
After adjusting for age, race and ethnicity, smoking and poverty status, the increased risk remained significant, ranging from 24% to 31%.
The highest-intake group alone showed a possible 34% higher risk, although that result did not reach statistical significance.
That may reflect the smaller number of prostate cancer cases in that subgroup.
The study is observational, so it cannot prove ultra-processed foods directly caused prostate cancer.
Diet data can also be imperfect, and people who eat more ultra-processed foods may differ in many other ways.
Still, the result fits a broader pattern.
Ultra-processed diets have been linked with obesity, poor metabolic health, cardiovascular disease, inflammation and early death.
Researchers think several mechanisms could be involved in cancer risk.
These include metabolic disruption, oxidative stress, chronic inflammation and changes in the gut microbiome.
- Microwave-assisted frying could make chips less oily
- Gut microbes may affect how many calories you absorb from food
- Gut microbiome may shape how diet influences cancer growth and immune defence
For a diabetes audience, the overlap is hard to ignore.
The same foods that make glucose control, weight management and blood pressure harder may also be part of a wider cancer-risk picture.
That does not mean every packaged food is dangerous.
But it does mean a diet built around soft drinks, processed meats, crisps, sweet cereals and ready-made snacks is not neutral.
The practical move is not perfection.
It is replacing the most frequent ultra-processed foods with simpler staples more often: whole grains, pulses, vegetables, fruit, eggs, fish, yoghurt, nuts and minimally processed proteins.
In prostate cancer prevention, as in diabetes care, the boring foundations still matter.
