What UK Studies Show About Ultra-Processed Food

Research suggests that ultra-processed foods (UPFs) provide a substantial share of dietary energy in the UK. Estimates depend on the age group, survey period and classification method. Reviewed 15 October 2026; the historical studies below should not be read as a fresh measurement of diets in 2026.

Key Facts & Figures

  • SACN’s 2025 review summarised earlier UK estimates ranging from 51% of energy in adults to 68% in children; these are not one current national figure.
  • A 2024 study of UK adolescents’ 2008/09–2018/19 diet records found a mean 66% of energy from UPFs.
  • A UK twin-cohort study published in 2024 found 59% of energy from UPFs at age seven.
  • The same cohort averaged 47% at 21 months; the increase describes ageing within a cohort, not a recent national time trend.
  • The adolescent study found differences by socioeconomic group; survey subgroup estimates are not percentages of people who eat any UPF.
  • A 2024 BMJ umbrella review found associations with 32 health outcomes, with varying strength and quality of evidence.
  • An association does not prove that processing caused an outcome; diet quality and other factors can affect the findings.
  • NOVA divides food into four groups according to processing and its purpose.
  • UK dietary advice continues to emphasise a balanced diet and limits on foods high in saturated fat, salt and free sugars.

What Is an Ultra-Processed Food?

The NOVA food classification system, developed by researchers at the University of São Paulo, categorises foods into four groups:

  • Group 1: Unprocessed or minimally processed foods, such as fruit, vegetables, plain milk, eggs and foods preserved by freezing or drying without added ingredients.
  • Group 2: Processed culinary ingredients used in cooking, such as oils, butter, sugar and salt.
  • Group 3: Processed foods made by combining foods with ingredients such as salt, oil or sugar, for example some canned foods and simple breads.
  • Group 4: Industrial formulations using food-derived substances and processes or additives not typical of home cooking. Ingredient count alone does not reliably identify a UPF.

How to Interpret the Health Evidence

Diet quality: Many UPFs are high in saturated fat, salt or free sugars, but products within the category differ. A processing category does not replace checking nutritional content.

Energy intake: Food texture, energy density and eating rate are among the mechanisms being studied. It is inaccurate to say that every UPF is designed or proven to cause overeating.

Additives: Their presence alone does not establish harm. SACN highlights uncertainty about how much of the observed association is explained by processing rather than nutrition or other factors.

Study limits: Much of the evidence is observational. Differences in definitions, diet measurement and adjustment for other factors make precise causal claims difficult.

The Policy Response

Policy on nutrition and advertising should be distinguished from the UPF research classification:

  • SACN: Its 2025 evidence update found the associations concerning while retaining important uncertainty about causes.
  • Dietary advice: The Eatwell Guide remains the UK’s national model for a balanced diet.
  • Advertising: UK restrictions on identifiable less healthy products began on 5 January 2026, including a TV watershed and restrictions on paid online advertising, subject to exemptions. They are not a ban on all UPFs.
  • Practical choices: Compare nutrition labels and include fruit, vegetables, wholegrains and other sources of fibre, rather than treating all processed foods as equivalent.

Written by Food Safety Experts

This article was created by the team at Level 2 Food Hygiene, dedicated to promoting food safety and public health across the UK.

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Mark McShane
Mark McShane
Health & Safety Training Specialist, Online CPD Academy

Mark writes about food safety, food hygiene and accredited online training for Level 2 Food Hygiene Certificate, part of Online CPD Academy.