Are crisps ultra-processed? Not all of them — and the honest answer is one people rarely expect. A plain crisp made from potatoes, oil and salt is a processedfood under NOVA, group 3, not group 4. Flavoured crisps are the ones that typically cross the line: cheese & onion, salt & vinegar and prawn cocktail seasonings usually bring flavourings, flavour enhancers and sometimes colours, and those are the cosmetic-additive markers that make a food ultra-processed. Reconstituted crisps pressed from potato flakes typically land in group 4 as well.
The split is more legible than most NOVA questions, which makes crisps a useful worked example. If your instinct was that crisps must be ultra-processed because they are salty, fatty and moreish, the framework is about to disagree with you.
Are crisps ultra-processed? The short version
The NOVA classificationsorts foods by the extent and purpose of industrial processing, not by their nutrients. Group 1 is unprocessed or minimally processed food. Group 2 is culinary ingredients such as oil, salt and sugar. Group 3 is processed food: group 1 foods with group 2 ingredients added, usually to preserve them or make them palatable. Group 4 is ultra-processed food — industrial formulations built from derived substances and cosmetic additives.
A crisp aisle contains at least three different answers:
- Plain salted crisps:potatoes, oil, salt. A group 1 food plus two culinary ingredients. That is textbook NOVA 3 — the same construction that puts salted nuts or tinned fish in oil in group 3.
- Flavoured crisps: once the seasoning brings flavourings, flavour enhancers, colours or a longer additive system, the bag typically becomes NOVA 4. Same potato, different formulation.
- Stacked or reconstituted crisps: made from dehydrated potato flakes, starches and emulsifiers rather than slices of potato. Typically NOVA 4, on the ingredients rather than the seasoning.
Why a plain crisp is only a processed food
Strip a plain crisp back to its ingredient list and there is very little to argue with: potatoes, sunflower or rapeseed oil, salt. Slicing a potato thinly and frying it in oil is a technique any home cook can perform, and the three ingredients are all things you would find in a domestic kitchen. NOVA cares about that. Group 4 is defined by cosmetic additives — flavourings, colours, non-sugar sweeteners, emulsifier systems used to imitate or enhance sensory qualities — and by industrial ingredients rarely used at home, such as protein isolates, maltodextrin, modified starches or glucose-fructose syrup. A plain crisp typically contains none of them — check the pack, because some lightly salted ranges carry more than the name suggests.
Frying at industrial scale does not change the group either. Neither does the packet, the factory, or the fact that nobody would call crisps a health food. NOVA describes what went in and why, not how a food makes you feel about yourself.
Worth flagging honestly: NOVA coders do not always agree on borderline products. When 159 and 177 evaluators independently scored two lists of foods in a 2022 study, agreement was only fair — a Fleiss kappa of 0.32 and 0.34. Plain crisps are cleaner than most borderline cases, but some coders will still argue about a “lightly salted” bag carrying an antioxidant or a yeast extract. Read the pack rather than trusting a category rule.
Flavoured crisps: where the seasoning tips it over
Turn a plain crisp into cheese & onion and the ingredient list usually doubles. Seasonings are typically built on dried dairy or vegetable powders, sugars, yeast extract, flavourings, flavour enhancers such as the glutamates, and acidity regulators — salt and vinegar flavours in particular tend to rely on those to get the sharpness without wetting the crisp. Some ranges add colours as well.
Flavourings, colours and enhancers used to build a taste that the underlying food does not have are exactly what NOVA means by cosmetic additives, so a flavoured crisp typically reads as group 4. The nuance that trips people up is that not every additive counts. Acidity regulators are there for shelf-life and sharpness, and like preservatives, antioxidants and stabilisers they do not on their own move the group — those keep a food stable rather than making it taste of something else, and NOVA leaves them in group 3. Sugar and salt are culinary ingredients rather than additives, so seasoning with them does not move a food to group 4 either. It is the flavourings, enhancers and colours — the sensory engineering — that do.
There is a middle ground. A crisp seasoned only with kitchen ingredients — sea salt, cider vinegar, black pepper — can stay in group 3. Dried dairy and vegetable powders are a genuine grey area: some coders read an industrially dried cheese powder as a derived fraction and push the bag to group 4, others treat it as a concentrated food. Some hand-cooked and premium ranges are formulated without cosmetic additives and some are not, so we are not naming brands: recipes change, and the same manufacturer often sells both kinds.
Stacked and reconstituted crisps
The tubes and stacks are a different product entirely. Rather than slicing potatoes, these are made by rehydrating dehydrated potato flakes with starches, oil and emulsifiers into a dough, pressing it into identical shapes and frying or baking it. That is a food reassembled from fractions of a potato rather than made from one, and the seasoning sits on top of it. Both halves of that description point at NOVA 4, which is why reconstituted crisps typically classify as ultra-processed even in their plainest version.
Salt and fat are a nutrition question, not a NOVA one
This is the part to get right. A plain crisp being NOVA 3 does not make it a good food, and nothing above should be read that way. Crisps are energy-dense, most bags carry a meaningful amount of salt, and depending on the frying oil they can contribute saturated fat. Those are real nutrition issues, and they apply to the group 3 bag exactly as much as the group 4 one.
NOVA does not measure any of it. It is a processing framework, not a nutrition score, and it will place a salty fried snack in group 3 while placing a low-calorie flavoured yoghurt in group 4. If you want the nutrition answer for crisps, read the salt and saturated fat per 100g and the portion size. If you want the processing answer, read the ingredients. Treating one as a proxy for the other is the most common mistake people make with UPF.
What to check on the label
Our guide to spotting ultra-processed food on the label applies neatly here, because crisp ingredient lists are short enough to scan in seconds:
- Three or four ingredients: potatoes, oil, salt, maybe a real seasoning. Typically NOVA 3.
- Flavouring, flavour enhancer, colour:the words “flavouring”, “natural flavouring”, a glutamate or ribonucleotide enhancer, or a colour such as paprika extract used cosmetically. Typically NOVA 4.
- Dehydrated potato, potato flakes, modified starch, emulsifier: a reconstituted crisp. Typically NOVA 4 regardless of flavour.
- Maltodextrin, dextrose, glucose-fructose syrup: industrial ingredients that rarely appear in a home kitchen, and strong group 4 signals.
Or skip the squinting: scanning the barcode in Cull's UPF scannerreturns the NOVA verdict for that exact product, along with its additives and an overall score — handy when the plain and flavoured versions of the same crisp are hanging next to each other and only one of them has changed group.
So how much should this change what you buy?
Modestly. The evidence linking ultra-processed food to poor health outcomes is observational: a 2024 umbrella review in the BMJ covering around 9.9 million participants reported associations across a wide range of outcomes, with the certainty of evidence varying considerably between them. Association is not causation, and the UK picture is deliberately careful. SACN's 2023 position statement found the associations concerning but said limitations in the evidence mean it is unclear whether processing itself is to blame rather than these foods simply being high in energy, saturated fat, salt and free sugars. Its rapid evidence update, published on 2 April 2025, did not overturn that caution.
For crisps specifically, that leaves a practical reading rather than a rule. If you are trying to cut ultra-processed food, the plain bag is a genuine swap and the flavoured one is not. If you are trying to cut salt or calories, the NOVA group is not the number you should be looking at. Both are worth knowing. Neither is a reason to feel anything much about a packet of crisps.
Sources
- Monteiro et al. (2016) — NOVA. The star shines bright, World Nutrition
- Open Food Facts — NOVA groups for food processing
- Braesco et al. (2022) — Ultra-processed foods: how functional is the NOVA system? European Journal of Clinical Nutrition
- Lane et al. (2024) — Ultra-processed food exposure and adverse health outcomes, BMJ umbrella review
- SACN (2023) — Position statement on processed foods and health
- SACN (2025) — Processed foods and health: rapid evidence update summary