What Are Ultra Processed Foods and Should You Avoid Them?
What Are Ultra Processed Foods and Should You Avoid Them?
Ultra processed foods are usually industrially formulated products containing several ingredients, some of which are not commonly used in a home kitchen. Sugary drinks, confectionery, packaged snacks, reconstituted meat products and many ready meals are common examples.
However, the category is much broader than foods most people would consider unhealthy. Depending on the classification used, it can also include wholemeal bread, baked beans, fortified breakfast cereals, flavoured yoghurt and some plant based alternatives.
You do not need to remove every ultra processed food from your diet. Current UK advice is to focus on the overall nutritional quality of what you eat. Most people are likely to benefit from reducing foods that are high in calories, saturated fat, salt or free sugars and low in fibre, while eating more fruit, vegetables, pulses and wholegrain foods.
The short answer
Food processing is not automatically harmful. Cooking, freezing, pasteurising, fermenting and canning can make food safer, more convenient and available for longer.
Ultra processed food is most commonly defined using the NOVA classification, which groups foods according to the nature, extent and purpose of processing.
Research consistently links diets high in ultra processed food with several poorer health outcomes, but much of that evidence is observational.
It remains difficult to separate the effect of processing from calories, saturated fat, salt, sugar, fibre, food texture, eating speed, income and other factors.
Not every ultra processed product has the same nutritional value or likely health effect.
You do not need to follow a completely unprocessed diet.
A practical approach is to base more meals on fruit, vegetables, pulses, wholegrains and straightforward protein sources while using labels to compare packaged foods.
What does processed food actually mean?
Almost all food is processed in some way before it reaches the plate. Washing, chopping, cooking, freezing, pasteurising, fermenting and canning are all forms of processing.
Processing can serve important purposes. It can:
make food safe to eat
prevent harmful bacteria from growing
extend shelf life
reduce food waste
make seasonal foods available throughout the year
improve convenience
add or preserve nutrients
make some foods edible or easier to digest
The word processed therefore does not tell you whether a food is healthy. Frozen peas, tinned tomatoes, plain yoghurt, cheese and wholemeal bread have all been processed, yet they can contribute usefully to a balanced diet.
The debate about ultra processed food concerns particular types of industrial formulation and the dietary patterns in which they are consumed, rather than every change made to a raw ingredient.
What is the NOVA classification?
There is no single universally agreed definition of ultra processed food. The system used most often in research is called NOVA. It divides food into four broad groups.
Group 1: Unprocessed or minimally processed foods
These are foods that remain close to their original form. Processing may include cleaning, chopping, chilling, freezing, drying or pasteurising.
Examples include:
fresh or frozen fruit and vegetables
plain oats
rice
potatoes
eggs
fresh meat and fish
plain milk
beans and lentils
unsalted nuts and seeds
Group 2: Processed culinary ingredients
These are substances usually used to prepare and season meals rather than eaten alone.
Examples include:
vegetable oils
butter
sugar
salt
Group 3: Processed foods
These are generally made by combining foods from the first group with culinary ingredients. They often have a relatively short ingredient list.
Examples can include:
vegetables canned with salt
fruit canned in syrup
traditional cheese
bread made from flour, water, yeast and salt
salted nuts
smoked or canned fish
Being in this group does not automatically make a product healthy. A home made cake can still be high in sugar, saturated fat and calories even if NOVA does not classify it as ultra processed.
Group 4: Ultra processed foods
These are industrial formulations often made using substances extracted from foods, modified ingredients and additives designed to create a particular flavour, texture, appearance or shelf life.
Common examples include:
sugary soft drinks
many sweets and chocolate products
packaged biscuits, cakes and pastries
many savoury snacks
some instant noodles and soups
some ready meals
reconstituted meat products
many sweetened breakfast cereals
some flavoured yoghurts
some protein bars and meal replacement products
many mass produced breads
some vegetarian and vegan meat alternatives
The classification depends on the ingredients and manufacturing purpose, not simply the name of the food. Two similar looking loaves of bread or pots of yoghurt can fall into different groups.
How can you identify an ultra processed food?
There is no perfect supermarket shortcut. A long ingredient list can provide a clue, but length alone does not decide whether a product is healthy or whether NOVA would classify it as ultra processed.
Ingredients commonly associated with ultra processed formulations include:
modified starches
protein isolates
maltodextrin
hydrogenated oils
emulsifiers
artificial flavours or colours
sweeteners
thickeners and stabilisers
flavour enhancers
This does not mean that one unfamiliar ingredient makes a food dangerous. Food additives must be assessed for safety and authorised before they can be used in the UK. The ultra processed category concerns how the product is formulated as a whole, not a rule that every additive is harmful.
It can be more useful to ask:
Is this product high in saturated fat, salt or sugar?
Does it provide useful fibre or protein?
Does it contain fruit, vegetables, pulses or wholegrains?
How large is the portion I usually eat?
Is it replacing a more nourishing meal or simply helping make one practical?
Are all ultra processed foods unhealthy?
No. The category covers products with very different nutritional profiles.
Sugary drinks, confectionery and many packaged snacks provide few essential nutrients and can be easy to consume in large amounts. Reducing these is consistent with established UK advice.
Other foods classed as ultra processed may provide fibre, protein, calcium, vitamins or minerals. Examples can include:
wholemeal supermarket bread
lower sugar wholegrain cereal
baked beans
lower sugar yoghurt
fortified plant based drinks
some convenient ready meals containing vegetables and pulses
These foods may be affordable, accessible and useful for people who have limited time, cooking facilities, mobility or energy. Removing them without a suitable replacement could make a diet less nutritious, more expensive or harder to maintain.
A useful example is bread. A packaged wholemeal loaf may be placed in the ultra processed category because of emulsifiers or other ingredients. A home made white loaf may not be. The wholemeal loaf can still provide more fibre and may be the more practical nutritional choice.
What does the research show?
Research has consistently found associations between higher consumption of ultra processed foods and an increased risk of obesity, type 2 diabetes, cardiovascular disease and some other adverse outcomes.
The Scientific Advisory Committee on Nutrition reviewed this evidence in 2023 and again in a rapid update published in 2025. It considered the associations concerning but highlighted important limitations.
Most long term evidence is observational. Researchers record what people eat and compare it with later health outcomes. This can identify patterns but cannot easily prove that processing itself caused the outcome.
People who eat more ultra processed food may also differ in:
overall calorie intake
fruit and vegetable intake
fibre intake
smoking or alcohol use
physical activity
income and food access
working patterns
underlying health
Researchers attempt to adjust for these differences, but no analysis can remove every source of uncertainty.
SACN also noted that diets high in ultra processed food are often high in calories, saturated fat, salt and free sugars and low in fruit, vegetables and fibre. These nutritional factors are already known to affect health.
What have controlled trials found?
Controlled trials can provide stronger evidence because researchers determine which foods participants receive. However, these trials are difficult and expensive, so they have generally been small and short.
A widely discussed United States trial published in 2019 involved 20 adults who lived in a research unit. Participants ate an ultra processed diet for two weeks and an unprocessed diet for two weeks in a random order. They could eat as much or as little as they wanted.
The presented diets were designed to be similar in calories, macronutrients, sugar, sodium and fibre. Participants ate about 500 more calories each day during the ultra processed period. On average, they gained about 0.9 kilograms during that diet and lost about 0.9 kilograms during the unprocessed period.
This suggests that features of the meals may have influenced how much people ate. However, 20 people over a few weeks cannot answer every question about long term health or every type of processed food.
What did the 2025 UK trial find?
A UK randomised crossover trial published in 2025 compared ultra processed and minimally processed diets that both followed the Eatwell Guide.
Fifty five adults living with overweight or obesity were enrolled, and 50 provided information for the main analysis. Participants received each diet for eight weeks and could choose how much of the provided food to eat.
Both diets produced weight loss, probably because both followed healthier nutritional guidance than the participants' usual diets. Average weight loss was greater during the minimally processed diet.
The result is useful because it suggests that food processing or features related to it may matter even when broad dietary guidance is followed. It does not establish that every ultra processed product causes weight gain.
In 2026, several researchers published formal academic criticisms of the trial. They questioned whether differences in nutrient composition, food choice and study design could explain some of the result without processing being the sole cause. The original study therefore contributes important evidence, but the interpretation remains debated.
Why might some ultra processed foods encourage overeating?
There may not be one single mechanism. Possible explanations include:
Energy density
Many ultra processed foods provide a large number of calories in a relatively small weight or volume. This can make it easier to consume more energy before feeling physically full.
Fast eating rate
Soft textures and foods that require little chewing can be eaten quickly. The body may have less time to register fullness before a larger amount has been consumed.
Strong taste and easy availability
Products may be designed to be convenient, appealing and consistent. Large portions, frequent marketing and easy access can all influence how often and how much people eat.
Nutritional profile
Many products are high in free sugars, saturated fat or salt and low in fibre. Fibre contributes to digestive health and can help meals feel more satisfying.
Food structure
Grinding, refining and reformulating ingredients can change the structure of food and how quickly nutrients become available. Researchers are still investigating how much this matters independently of the nutrient content.
Additives and packaging
Researchers are studying whether particular additives, combinations of additives or substances from packaging affect health. This is an active area of research. It is not evidence that every approved additive or every food containing one is unsafe.
Should you avoid ultra processed foods completely?
For most people, complete avoidance is unnecessary and may be impractical.
The current UK position does not instruct everybody to eliminate all ultra processed food. SACN concluded in 2025 that most people are likely to benefit from reducing processed foods that are high in energy, saturated fat, salt and free sugars and low in fibre.
That is a more useful goal than trying to make every meal perfect. A diet can include some convenient packaged foods while still being based around:
vegetables and fruit
beans, peas and lentils
potatoes and wholegrain starchy foods
eggs, fish, lean meat or other suitable protein sources
milk, yoghurt or fortified alternatives
nuts and seeds where suitable
unsaturated oils in modest amounts
The overall pattern across days and weeks matters more than whether one product meets a disputed classification.
How to make practical choices in the supermarket
Use the traffic light label
Front of pack traffic lights show whether a product is low, medium or high in fat, saturated fat, sugars and salt.
More green and amber values generally make a product a better everyday choice than a similar product with several red values. One red value does not make a food forbidden, but it can help guide frequency and portion size.
Compare similar products
Compare bread with bread, cereal with cereal and ready meals with similar ready meals. Look for options with:
less salt
less saturated fat
less sugar
more fibre
a sensible portion size
Look at what the product adds
A convenient food can still be useful if it provides wholegrains, vegetables, pulses, protein or calcium. Baked beans on wholemeal toast offers a different nutritional contribution from sweets or a sugary drink even if all are placed in the same processing group.
Consider the meal, not only the packet
A ready meal can be improved by adding frozen vegetables or a side salad. Plain yoghurt can be combined with fruit and oats. A tinned soup may be more satisfying with wholegrain bread and an additional protein source.
Keep cost and capacity realistic
Freshly cooking every meal is not possible for everyone. Frozen vegetables, tinned pulses, microwave rice, wholemeal bread and other convenient staples can help build balanced meals with little preparation.
Healthy eating advice should not shame people for using food that fits their budget, disability, working hours, caring responsibilities or available kitchen facilities.
Simple ways to eat less ultra processed food
You do not have to replace everything at once. Consider one change that is affordable and realistic.
Examples include:
replace some sugary drinks with water or unsweetened drinks
use plain oats more often instead of very sweet breakfast products
choose wholegrain bread with a better fibre and salt profile
keep frozen vegetables and tinned pulses available for quick meals
choose plain or lower sugar yoghurt and add fruit
replace some processed meat meals with beans, lentils, eggs, fish or another suitable protein
portion snacks into a bowl rather than eating directly from a large packet
add vegetables or pulses to a ready meal rather than abandoning convenient meals entirely
cook an extra portion when practical and freeze it for another day
The best changes are the ones a person can continue without creating excessive cost, stress or restriction.
Ultra processed food and weight loss
Reducing some ultra processed foods may help weight management when it lowers calorie intake, improves meal quality or makes hunger easier to manage.
However, the label does not override the rest of nutrition. A minimally processed food can still be high in calories, while an ultra processed food may provide useful protein, fibre or portion control.
Weight loss still depends on energy balance over time, but that does not mean every calorie has the same effect on hunger, eating speed or satisfaction. Meals containing vegetables, wholegrains, pulses and protein may help create a more filling dietary pattern.
Avoid turning the NOVA system into another rigid diet. A very restrictive approach can be difficult to sustain and may be unsuitable for people with a history of disordered eating. Anyone who feels anxious or guilty around food should seek support from an appropriately qualified professional.
Ultra processed foods and Keltoi
Keltoi Wellness provides doctor led remote weight management support for eligible adults across the UK.
The website assessment gives Dr Waqar Ahmed a snapshot of a patient's health, medicines and weight management history. It does not assign foods as good or bad, diagnose a nutritional problem or decide which treatment is suitable.
Clinical and prescribing decisions remain with Dr Ahmed. Patients should tell him about allergies, digestive conditions, diabetes, kidney disease, pregnancy, an eating disorder history or another issue that may affect nutrition or treatment.
General advice to eat fewer foods high in calories, saturated fat, salt and free sugars does not replace an individual plan from a doctor or registered dietitian.
Focus on the overall pattern
Ultra processed food is a useful area of research, but it is not a perfect test of whether one item belongs in a healthy diet.
The evidence linking high intake with poorer health is concerning, and controlled trials suggest that minimally processed diets may help reduce energy intake or support greater weight loss. Important questions remain about definitions, nutritional differences and the extent to which processing itself causes harm.
You do not need to fear every packet or unfamiliar ingredient. Start with established principles: eat more vegetables, fruit, pulses, wholegrains and fibre, compare labels, reduce foods high in sugar, salt and saturated fat, and choose changes that are realistic for your life.
Frequently asked questions
What is the simplest definition of ultra processed food?
It is usually an industrial formulation made using several ingredients, often including substances or additives not commonly used in a home kitchen. The most widely used definition comes from the NOVA classification.
What are common examples of ultra processed foods?
Examples include sugary drinks, confectionery, packaged biscuits, many savoury snacks, some instant noodles, some ready meals, reconstituted meat products and many sweetened cereals. The exact classification depends on the recipe and manufacturing process.
Is all supermarket bread ultra processed?
No. Classification depends on the ingredients and method. Many mass produced loaves are classed as ultra processed, but this does not mean they should all be avoided. Wholemeal bread can be a useful and affordable source of fibre.
Are baked beans ultra processed?
Some formulations may be placed in the ultra processed category. Baked beans can still provide fibre and protein. Compare products for salt and sugar and consider how they fit into the whole meal.
Are frozen foods ultra processed?
Not automatically. Plain frozen fruit, vegetables, fish and meat are generally minimally processed. A frozen prepared product may be ultra processed depending on its ingredients and formulation.
Are protein bars and shakes ultra processed?
Many are, but their nutritional content varies. Some may be useful in a specific clinical or practical situation. Check calories, protein, fibre, sugar and the wider diet rather than relying on the processing label alone.
Are additives dangerous?
An additive must be assessed and authorised before it can be used in UK food. Researchers continue to study some additives and combinations, but the presence of an E number does not by itself prove that a food is harmful.
Do I need to cook everything from scratch?
No. Packaged and prepared foods can make a balanced diet affordable and manageable. Choose useful staples, compare labels and add fruit, vegetables, pulses or wholegrains where practical.
Will cutting out ultra processed food make me lose weight?
Not automatically. It may help if the change reduces calorie intake and improves fullness, but total intake and the overall eating pattern still matter. A sustainable change is usually more useful than complete avoidance.
Is home made food always healthier?
No. A home made cake, pastry or fried meal can still be high in calories, saturated fat, salt or sugar. Home preparation gives more control over ingredients, but it is not a guarantee of nutritional quality.
Sources and further reading
Scientific Advisory Committee on Nutrition: Rapid evidence update on processed foods and health
Scientific Advisory Committee on Nutrition: Statement on processed foods and health
UK Government: The Eatwell Guide
NHS: The Eatwell Guide
Food Standards Agency: Check the label
UK Government: Food additives and safety
British Nutrition Foundation: Ultra processed foods
Cell Metabolism: Controlled trial of ultra processed and unprocessed diets
Nature Medicine: Ultra processed and minimally processed diets following UK guidance
Nature Medicine: Concerns about evidence from the 2025 UK trial
Nature Food: Validity and utility of NOVA and ultra processed food
Last updated: August 2026
Disclaimer: This article provides general information and does not replace individual advice from a doctor or registered dietitian. People with allergies, coeliac disease, diabetes, kidney disease, digestive conditions, pregnancy, nutritional deficiencies or a history of disordered eating may need tailored support.