Nutrition
By Hannah Brooks · Updated August 23, 2026 · Fact-checked
“Ultra-processed” has become one of those phrases that gets used constantly and defined almost never. People hear it and picture a bag of crisps, then feel vaguely guilty about their yoghurt without knowing why. It’s worth pinning down, because the category is broader and stranger than most people assume — and because the research linking it to health outcomes has gotten hard to ignore.
What the term actually means
The classification most researchers use is called NOVA, developed by a team in Brazil. It sorts food by how much industrial processing it has been through rather than by nutrient content, which is what makes it useful — and occasionally counterintuitive.
- Unprocessed or minimally processed: vegetables, fruit, eggs, milk, plain rice, dried beans, fresh and frozen meat.
- Processed culinary ingredients: oil, butter, sugar, salt — things you cook with rather than eat alone.
- Processed foods: tinned beans, cheese, cured meat, fresh bread. Usually made from group-one foods plus salt, sugar or oil.
- Ultra-processed: industrial formulations built largely from refined substances and additives — emulsifiers, colourings, non-sugar sweeteners, flavourings, protein isolates.
That last group is where things get surprising. Most packaged sliced bread qualifies. So do many breakfast cereals marketed as healthy, most plant-based meat substitutes, flavoured yoghurts, protein bars, and a good share of ready meals. The category isn’t a synonym for junk food, and that’s exactly why it’s easy to misjudge how much of it you eat.
Why researchers keep coming back to it
Large observational studies across several countries have found associations between higher ultra-processed intake and higher rates of cardiovascular disease, type 2 diabetes, obesity and all-cause mortality. Observational work can’t prove cause, and people who eat a lot of these foods differ in other ways too — income, smoking, activity levels — which researchers try, imperfectly, to adjust for.
The more interesting evidence came from a controlled feeding trial at the National Institutes of Health. Participants lived in a research unit and ate either ultra-processed or minimally processed diets, matched for calories, sugar, fat, fibre and sodium, with unlimited amounts on offer. On the ultra-processed diet, people ate roughly 500 more calories per day and gained weight. On the other, they lost it. Same nutrients on paper, very different outcomes.
The likely reasons it’s easy to overeat
Nobody has fully settled why, but a few explanations have decent support. These foods are soft. They require little chewing and get eaten fast, and eating speed is one of the more reliable predictors of eating more. They’re also engineered for a specific combination of salt, sugar, fat and texture that pushes past the point where whole foods would have stopped you.
Then there’s what’s missing. Fibre, water and intact food structure all contribute to fullness, and processing tends to strip all three. A whole apple and a glass of apple juice contain similar sugar; only one of them makes you feel like you’ve eaten. Some researchers are also examining emulsifiers and their effect on the gut microbiome, though that work is early and shouldn’t be oversold.
How to spot it in the aisle
You don’t need to memorise the NOVA groups. A couple of quick habits do most of the work.
Read the ingredients rather than the nutrition panel. If the list contains things you’d never find in a home kitchen — maltodextrin, soy protein isolate, mono- and diglycerides, colourings with numbers — you’re almost certainly holding an ultra-processed product. Length is a decent proxy too, though not a perfect one. Our guide to reading nutrition labels covers the panel itself.
Ignore the front of the packet entirely. “High protein”, “made with real fruit”, “no artificial colours” and “plant-based” tell you about the marketing budget, not the processing. Some of the most heavily processed products in the shop carry the most wholesome-looking labels.
Eating fewer of them without losing your mind
Cutting these foods out entirely isn’t realistic for most households, and the attempt usually collapses within a fortnight. Reducing the proportion is both achievable and probably where most of the benefit sits.
- Start with what you eat most. Swapping a daily breakfast cereal matters more than swapping the biscuits you have twice a month.
- Upgrade rather than eliminate. Plain yoghurt with fruit instead of the flavoured tubs. Bakery bread with four ingredients instead of the sliced loaf with twenty.
- Watch the drinks. Soft drinks, energy drinks and sweetened coffees are pure ultra-processed calories with almost no fullness attached. Our piece on where added sugar hides maps out the usual suspects.
- Cook one or two more meals a week. Not every meal. One or two. Beans, eggs, frozen vegetables and tinned fish make this genuinely fast.
- Change what’s within reach. Most of this is proximity, not willpower. Fruit on the counter, crisps out of sight.
A necessary word about cost and access
Advice in this area often carries an unspoken assumption that everyone has time, money, a decent kitchen and a supermarket nearby. Plenty of people have none of those. Ultra-processed food is cheap, shelf-stable and requires no equipment, and for many households it is a rational choice rather than a lazy one.
If money is tight, dried lentils, frozen vegetables, oats, eggs and tinned tomatoes are among the cheapest foods per serving in the shop. And a diet that’s part ultra-processed is not a failure. Perfect isn’t the target; a slightly better ratio is.
Frequently asked questions
Is all processed food bad for you?
No. Processing includes freezing, pasteurising, fermenting and tinning, all of which make food safer, cheaper or last longer. Frozen peas and tinned beans are excellent food. The concern sits specifically with the ultra-processed group.
Are protein bars and shakes ultra-processed?
Most are, by definition. That doesn’t automatically make them a poor choice — a shake after training or a bar in a bag on a long day can be genuinely useful. It does mean they shouldn’t be treated as health food or crowd out real meals.
How much is too much?
There’s no official threshold. In several high-income countries ultra-processed foods make up over half of average daily calories, and most researchers view that as high. Moving from most of your intake to a minority of it is a sensible, non-obsessive goal.
The takeaway
Ultra-processed food isn’t defined by how unhealthy it looks but by how it’s made, which is why so much of it hides behind sensible packaging. You don’t need to purge your kitchen or learn a classification system. Read ingredient lists instead of front-of-pack claims, fix the two or three items you eat every single day, and cook a little more often than you do now. That’s most of the benefit, and it’s a change you can still be making in a year.
This article is for general information only and is not medical advice. Talk with a qualified healthcare professional or registered dietitian about your individual dietary needs.