What Is Ultra-Processed Food (UPF)?

The definition, the distinction from other processed foods, and why it matters more than you might think.

Ultra-processed food is a term you will encounter regularly in nutritional discussion, but its meaning is often vague in popular use. People associate it loosely with junk food, fast food, or anything that comes in a packet. The actual definition is more specific and more useful than that, and understanding it changes how you think about food labels and dietary choices.

The concept comes from the NOVA food classification system, developed by Brazilian researchers led by Professor Carlos Monteiro at the University of São Paulo. NOVA classifies foods not by their nutrient content but by the extent and purpose of their processing. It divides foods into four groups, and the fourth group, ultra-processed foods, is the one with the strongest and most consistent associations with adverse health outcomes.

The four NOVA food groups

Group 1: Unprocessed or minimally processed foods

Fresh, dry, or frozen fruits and vegetables. Plain meat, fish, eggs, and milk. Dried legumes, plain nuts and seeds, plain whole grains. These foods may have been cleaned, cut, frozen, or dried, but they have not been fundamentally altered. No substances have been added to change their nature.

Group 2: Processed culinary ingredients

Ingredients extracted from food for use in cooking: oils, butter, flour, salt, sugar, vinegar. These are not typically eaten alone but are used to prepare Group 1 foods. They are processed by extraction or refining but are used in ways that are continuous with traditional food preparation.

Group 3: Processed foods

Foods made by adding Group 2 ingredients to Group 1 foods to preserve them or to develop flavour. Tinned vegetables in brine, cured meats, cheese, bread made with flour, yeast, water, and salt, preserved fish. Some processing has occurred, but the original food is still recognisable and the processing serves a preservation or culinary purpose.

Group 4: Ultra-processed foods

Industrial formulations made mostly or entirely from substances extracted from foods, supplemented with additives, and typically containing very few if any intact Group 1 foods. The defining characteristics are:

• Made from industrially extracted ingredients: glucose-fructose syrups, refined starches, protein isolates, hydrogenated fats, interesterified fats
• Contain additives not used in home cooking: emulsifiers, stabilisers, flavour enhancers, artificial colourings, sweeteners, humectants
• Designed to be hyperpalatable and convenient: engineered to maximise flavour and texture in ways that natural foods do not achieve
• Minimally nutritious from whole food sources: the original food matrix has been destroyed and partially reconstructed from industrial ingredients

Why ultra-processed is a distinct and meaningful category

The NOVA classification matters because ultra-processed foods are different from other processed foods in ways that nutrient content alone does not capture. Two foods can have similar macronutrient profiles but very different health associations depending on how they are made.

Whole grain bread made from flour, water, yeast, and salt is processed. It contains similar carbohydrates to a factory-produced soft white roll containing glucose syrup, emulsifiers, dough conditioners, and artificial flavourings. Both are grain products. But the whole grain bread falls into Group 3, and the factory roll falls into Group 4. The health outcomes associated with eating them regularly are different, and the nutrient label alone does not reveal this.

The hallmarks of ultra-processed foods on ingredient lists

You can usually identify ultra-processed foods from their ingredient lists without needing to apply the full NOVA classification:

• Ingredients you would not find in a domestic kitchen: emulsifiers (E numbers starting with E4xx), stabilisers, modified starches, protein isolates, invert sugar, maltodextrin
• Five or more ingredients in a food that could in principle be simple: bread with 12 ingredients, yoghurt with emulsifiers and sweeteners, cheese slices with stabilisers
• Additives primarily serving cosmetic or palatability purposes: colourings, artificial flavours, flavour enhancers

Why it matters for nutrition

Ultra-processed foods now account for approximately 57 percent of energy intake in the average UK diet. Large prospective cohort studies across multiple countries have found associations between higher ultra-processed food intake and increased risk of obesity, type 2 diabetes, cardiovascular disease, depression, and certain cancers. The associations persist after controlling for nutrient content, suggesting that something about ultra-processed food beyond poor macronutrient profiles drives the adverse outcomes.

Proposed mechanisms include displacement of more nutritious whole foods, disruption of gut microbiome composition by food additives, hyperpalatability driving higher caloric intake, and disruption of normal appetite signalling by engineered texture and flavour profiles that bypass natural satiety mechanisms.

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