What Is Ultra-Processed Food? A Balanced UK Guide to UPF

Ultra-processed food, or UPF, has gone from an academic term to a supermarket talking point in a few short years. You've probably seen headlines linking it to almost everything. But what does it actually mean, how do you spot it, and how worried should you be?

This guide sticks to what the evidence supports. The honest answer is somewhere between “it's poison” and “it's nothing to worry about”.

Processed isn't the same as ultra-processed

The NHS defines a processed food as any food or drink that has been changed in some way when it's made or prepared. By that measure, most of what we eat is processed. Pasteurised milk, frozen peas, tinned tomatoes and olive oil all count, and processing often has real benefits, like making food safe or helping it last.

“Ultra-processed” describes something narrower: foods that have been through more processing and often include ingredients you wouldn't usually have in your kitchen, such as preservatives, sweeteners and emulsifiers.

The NOVA classification

The term comes from NOVA, a system developed by researchers in Brazil that groups foods by the extent and purpose of their processing, rather than by their nutrients. It has four groups:

1. Unprocessed or minimally processed foods: fresh, frozen or dried fruit and vegetables, plain meat, fish, eggs, milk, plain oats, rice, pulses and nuts.
2. Processed culinary ingredients: things you cook with, like oils, butter, sugar and salt.
3. Processed foods: foods from group 1 with group 2 ingredients added, such as tinned vegetables, cheese, smoked fish and simple bread made from flour, water, salt and yeast.
4. Ultra-processed foods: products made mostly from substances extracted or refined from foods, plus additives, using industrial processes. Think fizzy drinks, packaged snacks and many ready meals.

The UK's Scientific Advisory Committee on Nutrition (SACN) reviewed the classification systems in 2023 and found NOVA was the only one potentially suitable for use in the UK. It also flagged real limitations: the groups are very broad, they put foods with very different nutritional value in the same category, and NOVA doesn't consider a food's nutrient content at all.

Common UPFs in the UK

The NHS gives these as examples of ultra-processed foods:

• Sweetened drinks
• Crisps
• Packaged cakes and biscuits
• Ice cream
• Sweets and chocolate
• Some ready meals
• Packaged meat pastries like pies and pasties

UPF makes up a big share of the typical UK diet. One analysis of the UK's National Diet and Nutrition Survey from 2008 to 2014 estimated that around 57% of calories came from ultra-processed foods. SACN notes that applying NOVA to UK survey data involves assumptions, so treat figures like this as estimates rather than precise counts.

How to spot UPF on a UK label

There's no UPF label on UK packaging, so the ingredients list is your best tool. The researchers behind NOVA suggest a simple test: a product is likely to be ultra-processed if its ingredients include at least one of these:

• Substances rarely used in home kitchens, such as high-fructose corn syrup, hydrogenated or interesterified oils, and hydrolysed proteins
• Additives that make food more appealing, such as flavourings, flavour enhancers, colours, emulsifiers, sweeteners and thickeners

A few practical tips for the supermarket:

• Ingredients are listed in order of weight, so the first few tell you what the product is mostly made of.
• A long list isn't automatically UPF, and a short one isn't automatically fine. A spice blend can have many ingredients; a fizzy drink might have only a few.
• Compare similar products. Two loaves, two yoghurts or two jars of pasta sauce on the same shelf can have very different ingredients lists.
• Use the traffic lights too. UPF status tells you about processing, not nutrition. The red, amber and green front-of-pack labels still tell you about fat, saturated fat, sugar and salt.

What the evidence shows

The case against diets high in UPF is significant. A 2024 umbrella review in the BMJ pulled together 45 pooled analyses covering almost 10 million people. It found that higher UPF intake was linked to a higher risk of 32 health outcomes, with the strongest evidence for death from heart disease, type 2 diabetes, anxiety and common mental health problems. The NHS says diets high in UPF have been linked to an increased risk of obesity, type 2 diabetes and heart disease.

There's some experimental evidence too. In a small, tightly controlled US trial, 20 adults lived in a research unit and ate either an ultra-processed or an unprocessed diet for two weeks each, eating as much as they wanted. On the ultra-processed diet they ate about 500 more calories a day and gained weight. On the unprocessed diet, they lost weight.

What it doesn't show (yet)

The evidence has real limits, and good sources are open about them:

• Most studies are observational. They show that people who eat more UPF have worse health, not that UPF causes it. SACN points out that factors such as total calories, smoking and income may not be fully accounted for.
• Processing or nutrients? Many UPFs are high in calories, saturated fat, salt or sugar. The NHS says it's not known whether UPFs are unhealthy because of the processing itself or because of what they contain.
• The quality is mixed. In the BMJ review, most of the pooled analyses were rated low or very low quality using the standard GRADE system.
• The trial was small and short. Twenty people for four weeks is a strong signal, not the final word.

SACN's conclusion is a fair summary: the associations are concerning, but the evidence needs to be treated with caution.

Not all UPF is equal

This is where a lot of advice goes wrong. The NHS says some ultra-processed foods can be part of a healthy diet, such as wholemeal sliced bread, wholegrain or higher-fibre breakfast cereals, and baked beans. These can be useful sources of fibre, which most UK adults don't get enough of. Cutting them out in the name of avoiding UPF could leave your diet worse, not better.

The NHS's practical advice is that most of us would probably benefit from eating less of the UPFs that are high in saturated fat, salt or sugar. That's a much more useful target than avoiding every ingredient you can't pronounce.

Practical swaps

You don't need to overhaul your diet. Small, repeatable swaps add up:

Tinned, frozen and dried foods are your friends here. Frozen vegetables, tinned pulses and plain oats are minimally processed, cheap and quick, and they help with your fibre too. Our guide to how much fibre you need a day has more ideas.

Keeping count without obsessing

It can be eye-opening to see how much UPF turns up in an ordinary week. Rather than aiming for zero, try counting how often it appears and nudging that number down over time.

GutBox does this when you log a meal: alongside fibre, it counts the ultra-processed items in what you eat each day, so you can see your usual pattern and what changed. It's meant as a gentle prompt, not a score to feel guilty about.