Butter, margarine and dietary fats
Partly documented
Evidence about industrial trans fats does not establish complete reversal of saturated-fat advice.
Fact-check
Trans fats and sugar guidance developed, but SACN maintained advice to reduce saturated fat.
Saturated-fat reduction remained; trans-fat knowledge changed ingredient advice.
Dietary guidance developed, but saturated fat restriction was not abandoned.
The evidence
Links go to the original records: Hansard, legislation, official guidance and news reports. A before-and-after pair is not always proof of a direct contradiction, so read the originals for exact wording.
Before: the earlier position
- Government review referencing earlier COMA recommendations (opens in new tab)
Scientific committee — Retrospective discussion - SACN review discussion of COMA guidance (opens in new tab)
Scientific committee — Retrospective original - SACN statement on earlier fat recommendations (opens in new tab)
After: what changed
- SACN saturated fats review, 2019 (opens in new tab)
Scientific committee — Continues advice to reduce saturated fat - PHE: new Eatwell Guide March 2016 (opens in new tab)
Government release - Government healthy eating guidance: unsaturated oils (opens in new tab)
Government guidance - SACN Saturated Fats and Health (opens in new tab)
- Eatwell Guide (opens in new tab)
What the source documents claim
These are summaries from the original documents behind this archive. They have not been checked word for word. Where they differ from the fact-check above, the fact-check is the more reliable account.
Low-Fat Diets & Swapping Butter for Margarine (1984–2016)
Document A, case 12
- Original advice
- Following the 1984 COMA report on diet and cardiovascular disease, UK government nutrition campaigns urged the public to cut total fat and replace butter with polyunsaturated margarine.
- How it was framed
- The 1994 'Balance of Good Health' food plate and Food Standards Agency guidance presented high-carbohydrate, low-fat eating and vegetable-oil spreads as the scientific consensus for heart health.
- Later change
- Subsequent Scientific Advisory Committee on Nutrition (SACN) reviews proved artificial trans fats in hydrogenated margarines significantly increased coronary heart disease, prompting reformulation and a major policy pivot toward cutting free sugars.
Butter, Margarine, and Dietary Fats (1980s–1990s vs. 2010s)
Document B, case 4
- First Announcement (1984–1991)
- Following the 1984 Committee on Medical Aspects of Food Policy (COMA) report, UK public health campaigns urged citizens to cut total fat intake and replace butter with vegetable-oil spreads and margarines to reduce blood cholesterol.
- The Reversal (2015–2016)
- After evidence showed early hydrogenated margarines contained harmful industrial trans fats, official guidelines moved away from blanket low-fat mandates and strict dietary cholesterol caps, advising instead to swap saturated fats for unsaturated plant oils rather than low-fat, high-sugar processed spreads.
This page combines register entries 12, 24, 29, which cover the same subject. Last reviewed: 12 November 2026.