Study Links Every 100g of Ultra-Processed Food to Higher Disease Risk

A pooled analysis of 51 prospective cohort studies covering 8,819,894 adults found that higher ultra-processed food (UPF) intake is linked to a meaningfully greater risk of cardiovascular disease, cancer, diabetes, digestive disease, depression, and death. The research, published in Family Medicine and Community Health on 22 September, quantifies the risk per 100 grams consumed daily. Every additional 100g of UPF was associated with a 14 per cent higher cardiovascular risk, 24 per cent higher diabetes risk, and 18 per cent higher risk of death from any cause.

What the study measured across 8.8 million people

Researchers searched published literature for cohort studies tracking ultra-processed food intake against health outcomes, ultimately combining 51 studies with follow-up periods ranging from two to 32 years. Participants’ average ages at enrolment ranged from 23 to 77. Their diets were assessed using food frequency questionnaires, 24-hour dietary recall, or full dietary history. All results were standardised to a common measure of ultra-processed food intake in 50-gram servings so comparisons could be made across very different studies. The studies came from the Americas, Europe, Asia and Oceania.

The specific health risks linked to UPF consumption

Comparing people with the highest reported ultra-processed food intake against those with the lowest, the analysis found a 24 per cent higher risk of cardiovascular events, a 12 per cent higher risk of cancer, a 23 per cent higher risk of obesity or being overweight, a 24 per cent higher risk of metabolic syndrome or diabetes, a 27 per cent higher risk of depression or anxiety, a 31 per cent higher risk of digestive disease, an 11 per cent higher risk of high blood pressure, and an 18 per cent higher risk of death from any cause. Per additional 100 grams of ultra-processed food eaten each day, the increases were smaller but still consistent: 14 per cent higher cardiovascular risk, 4 per cent higher cancer risk, 3 per cent higher risk of death.

What counts as ultra-processed food

Ultra-processed foods are defined as ready-to-eat or heat-and-serve products that have undergone extensive industrial processing. Typically, they contain more than five ingredients, including at least one additive not normally found in home kitchens such as emulsifiers, artificial flavourings, and chemical raising agents. These products are energy-dense and high in sugar and salt but low in dietary fibre, protein, vitamins and minerals. Studies show more than half the calories consumed in the UK come from ultra-processed food.

Why the debate over UPF safety remains unsettled

Scientists, doctors and dietitians cannot agree on why ultra-processed foods cause harm. Is it purely the high fat, sugar, salt and calorie content, or does the ultra-processing itself play a role? Maeve Hanan, a member of the British Dietetic Association, says there is a “growing hysteria” about UPFs, mainly because the messaging around them is so black and white. Researchers wanted to find out whether there are any safe consumption levels and where potential threshold levels for ill health might lie. The new data suggests risk rises consistently with intake, but does not establish a zero-risk threshold.

Final Thoughts

The study quantifies a dose-response relationship between ultra-processed food and disease risk, but experts warn against treating all UPFs as equally harmful. For UK consumers, the data suggests moderation matters, though complete avoidance may be unrealistic given that over half of daily calories come from these products.

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