Ultra-processed food: what you need to know

What the research shows

Large observational studies across many countries consistently link diets high in ultra-processed food with a higher risk of obesity, type 2 diabetes, heart disease, depression and earlier death. Estimates suggest that around half or more of the calories in the typical UK diet come from UPFs.

Observational studies cannot prove that UPF causes these problems, because people who eat a lot of it may differ in other ways. However, a tightly controlled study in the US found that when people could eat as much as they wanted, they ate roughly 500 kcal a day more on an ultra-processed diet than on a minimally processed one, even though the meals were matched for sugar, fat, fibre and salt. They gained weight on one and lost it on the other.

UK scientific advisers have said the concerns are worth taking seriously, while pointing out that the evidence has limitations and that the UPF category is very broad. That is a fair summary: the pattern is real, but the definition is blunt.

Why ultra-processed food is easy to overeat

Many UPFs are designed to be very tasty, soft and easy to eat quickly. They often combine fat, sugar and salt in ways rarely found in nature, and they need little chewing. Eating quickly gives your body less time to register fullness.

They also tend to be low in fibre and protein and high in calories per bite. A packet of biscuits can deliver several hundred calories in a few minutes without filling you up. Compare that with a plate of chicken, potatoes and vegetables with the same calories, which takes longer to eat and keeps you full for hours.

This is why reducing UPF often helps with fat loss even when people do not count calories. The foods that replace them are more filling, so people naturally eat less. Our guide to fibre explains part of the effect.

Not all processing is bad

It is easy to take the UPF message too far and start fearing anything in a packet. Plenty of processed foods are nutritious, cheap and convenient, and many are not ultra-processed at all:

• Frozen vegetables and fruit
• Tinned beans, lentils, chickpeas and tomatoes
• Tinned fish such as tuna, mackerel and sardines
• Plain yoghurt, skyr, cottage cheese and milk
• Oats and plain wholegrain cereals
• Wholemeal pasta and brown rice

Some foods classed as ultra-processed are still reasonable choices. Supermarket wholemeal bread, fortified plant milks, baked beans and some high-protein yoghurts all technically qualify, but they bring fibre, protein or useful nutrients. The same applies to protein powders and sports drinks, which have a clear purpose for people who train. Judge them by what they do for your diet and what they replace.

Cost and time are real barriers too. If ready meals are what make weeknights work, choose ones with a clear protein source and add a bag of frozen vegetables. That is a practical improvement, not a failure.

Realistic ways to eat less of it

UPFs are cheap, convenient and everywhere, and people juggling work, children and training rely on them for good reasons. The aim is to shift the balance, not to cook every meal from scratch.

1. Change your most frequent UPFs first. A daily packet of crisps, a sugary drink or a breakfast cereal has more impact than an occasional takeaway.
2. Swap for less processed versions. Plain yoghurt with fruit instead of a flavoured pot. Porridge oats instead of a sugary cereal. A cheese and ham sandwich from real bread instead of a packaged snack.
3. Build meals around whole foods. Protein, a starchy carbohydrate and vegetables. Use jars and sauces to save time if you need to.
4. Batch cook. A pot of chilli or curry at the weekend replaces several ready meals. See our high protein batch cook meals.
5. Keep easy whole-food snacks in the house. Fruit, nuts, boiled eggs, yoghurt.

Ultra-processed food and training

Gym culture has its own ultra-processed staples: protein bars, protein crisps, flavoured shakes, sports drinks and pre-workouts. Some are useful tools. A shake after an evening class at Lycan Strength when dinner is an hour away, or a gel in the middle of a long run, has a clear job to do.

The problem comes when these products replace meals. Three protein bars a day may hit a protein target, but they miss the fibre, vitamins and minerals that come with real food. Use them where they solve a practical problem and build the rest of your diet around meals. Our guides to high protein snacks and reading UK food labels help you tell the difference. If fat loss is also a goal, see how to track calories without obsessing.