Ultra‑Processed Foods: The Research That Is Changing How Scientists Think About What We Eat What the science says about ultra‑processed foods, brain health, and smarter school meals

Ultra‑processed foods (UPFs) are no longer a niche nutrition topic. A growing body of research links high UPF intake to cognitive decline, depression, and earlier mortality, prompting governments to treat this as a public health issue (1).

What “ultra‑processed” actually means (the NOVA classification)

Scientists use the NOVA system to sort foods by how much industrial processing they undergo, not just by calories or nutrients (2).

Group 1: Unprocessed or minimally processed foods whole foods like fresh fruit, vegetables, eggs, milk, plain meat, and frozen vegetables without additives (3).

Group 2: Processed culinary ingredients oils, butter, sugar, salt, and other ingredients used to cook Group 1 foods (4).

Group 3: Processed foods  simple products made by adding salt, sugar, or oil to Group 1 foods, such as canned vegetables, cheese, and freshly made bread.

Group 4: Ultra‑processed foods  industrial formulations made mostly from substances extracted from foods (like protein isolates and modified starches) plus additives, with little or no intact whole food.

A practical rule of thumb: if the ingredient list includes items you would not use in a home kitchen (for example glucose‑fructose syrup, carrageenan, polysorbate 80, or soy protein isolate), it is likely ultra‑processed.

Processing exists on a spectrum. Canned tomatoes, plain yogurt, and wholegrain bread are processed but still fit within a healthy diet. Ultra‑processed foods, by contrast, are engineered for hyper‑palatability, long shelf life, and convenience, often displacing freshly prepared meals (5).

This distinction matters because health risks track more closely with the degree of industrial formulation than with “processed” as a blanket label.

Landmark research: cognitive decline, depression, and early mortality

Recent studies have sharpened concern about UPFs and brain health.

A Harvard study found that older adults eating the most ultra‑processed foods had a 58% higher risk of developing dementia and a 46% higher risk of cognitive impairment without dementia compared with those eating the least (6).

Another large cohort study reported that for every 10% increase in the proportion of UPFs in the diet, the risk of cognitive impairment and stroke rose significantly, with faster declines in global cognition and executive function, even in people under 60.

A 2025 analysis of over 58,000 adults linked higher UPF consumption to greater risks of dementia, Parkinson’s disease, and multiple sclerosis.

People consuming more than 8.8 servings a day of UPFs had a 49% higher risk of developing depression.

A broad review tied higher UPF intake to roughly a 50% increased risk of death from cardiovascular disease and common mental health disorders, alongside higher risks of obesity, type 2 diabetes, and sleep disturbances (7).

These findings do not prove causation on their own, but the consistency across large cohorts and the dose‑response patterns are hard to ignore.

Why governments are treating this as a public health crisis

In the UK and elsewhere, policymakers are moving from awareness to action because UPFs dominate modern diets and are linked to costly chronic diseases (8).

Researchers and public health bodies are calling for stricter marketing restrictions to children and bans on providing UPFs in schools and public institutions.

In the US, bipartisan momentum is building around state‑level measures targeting artificial dyes and certain UPFs, even as the science continues to evolve (9).

The scale of the problem is large: ultra‑processed foods make up a substantial share of daily calories in many countries, which magnifies even modest per‑item risks at the population level.

The specific ingredients that appear most consistently in the research

While not every additive is harmful, certain industrial ingredients and product features show up repeatedly in UPF studies and in NOVA Group 4 definitions.

Common markers include:

Sugars and syrups: high‑fructose corn syrup, glucose‑fructose syrup, maltodextrin.

Industrial fats: hydrogenated or interesterified vegetable oils.

Protein isolates and modified starches: soy protein isolate, whey protein concentrate, modified starches.
one+1Emulsifiers and stabilisers: carrageenan, mono‑ and diglycerides, polysorbates, soy lecithin.

Flavour enhancers and artificial additives: monosodium glutamate, artificial flavours, artificial colours (for example Red 40, Yellow 5), non‑sugar sweeteners (aspartame, sucralose, acesulfame potassium).

Research suggests that ultra‑processed meats (such as deli meats and hot dogs) and sugar‑sweetened beverages show some of the strongest and most consistent links to cognitive impairment and poor memory (10).

What this means for school lunches, student diets, and focus in class

School meals shape what children learn to prefer and can affect attention, mood, and energy during the day.

Diets high in UPFs are associated with depression and anxiety‑related symptoms, which can undermine engagement and behaviour in class (11).

High UPF intake is linked to faster cognitive decline in adults and to poorer cognitive performance, raising concerns about long‑term brain health starting in youth (12).

Public health experts are urging removal of UPFs from school provision and tighter controls on marketing to children, reflecting the view that schools should model healthier defaults.

Practically, this points toward menus built from minimally processed staples (wholegrains, legumes, vegetables, plain dairy, eggs, and simple proteins), with fewer ready‑meals, reconstituted meats, sugary drinks, and snack‑style products (13).

How to eat better without making food into a source of anxiety

You do not need perfection to benefit. Experts recommend a gradual, realistic approach that reduces UPF exposure without turning meals into a stress test (14).

Helpful strategies:

Start with your top three UPFs. Identify the ultra‑processed items you eat most often (for example breakfast cereal, fizzy drinks, or ready meals) and find simple swaps you will actually stick with.

Read ingredient lists, not just nutrition panels. Look for short lists and familiar ingredients; long lists with industrial additives are a warning sign.style.

Use convenient but minimally processed foods. Canned beans, frozen vegetables, plain yogurt, tinned fish, eggs, and pre‑cooked grains can save time without pushing you into Group 4 (15).

Batch cook simple defaults. Prepare large portions of grains, legumes, and roasted vegetables once or twice a week to assemble quick meals on busy days (16).

Aim for progress, not purity. Moving from five ultra‑processed meals per week to three is meaningful. Many experts suggest a rough target where about 80% of your diet comes from minimally processed foods.

Think in terms of “more real food, less manufactured food,” rather than an all‑or‑nothing ban.

What the food industry is saying in response

The ultra‑processed food sector is pushing back hard against tighter regulation and negative framing.

Researchers describe the industry’s tactics as mirroring those used by tobacco, alcohol, and fossil fuel companies, including heavy lobbying, influencing government agencies, funding favourable research, and manufacturing scientific doubt.

Between 1999 and 2020, ultra‑processed food companies spent an estimated $1.15 billion on lobbying in the US, more than gambling, tobacco, or alcohol over the same period.

Major brands often stay quiet while industry bodies (such as FoodDrinkEurope and national trade associations) lead the defence, arguing that “not all UPFs are bad” and that focus should remain on nutrients rather than processing levels.

Coalitions backed by companies including Coca‑Cola, Kraft Heinz, General Mills, and Nestlé are actively working to block or dilute state‑level UPF and additive laws and to promote national labelling approaches that suit their interests (17).