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Population study: followed a group

Study of 15,203 UK people found mixed links between omega-6, omega-3 fats and inflammation

Crick and colleagues · International journal of epidemiology · 2025

Original title: The relationship between polyunsaturated fatty acids and inflammation: evidence from cohort and Mendelian randomization analyses.

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What the study found

Mixed

In cohorts, total omega-6 was linked to higher GlycA, an inflammation marker (mean difference = 0.52; 95% CI = 0.48, 0.55); omega-3 was too (0.33). A higher omega-6:omega-3 ratio went with higher CRP, GlycA and IL-6. Authors found no simple pro- vs anti-inflammatory split.

The study at a glance

Type of study
Population study: followed a group
Who or what was studied
15,203 people · adults and young people in two UK studies, plus gene data
What was tested
Dietary omega-3 and omega-6 fats and omega-6 to omega-3 ratio, vs blood inflammation markers
What it measured
Lab tests or markers
Who has a stake
No disclosure in PubMed
No disclosure in PubMed. Funded by Wellcome Trust and UK Medical Research Council.
Journal
International journal of epidemiology, 2025
Source
PubMed record 40550517. This page is based on the abstract only.

How much this study counts

  • –Shows a link, not a cause: people chose their own habits, and other differences between them may explain the result.
  • ✓Followed people over time, so habits were recorded before the outcome happened.
  • ✓Large: 15,203 people.
  • –Measured lab tests or markers, which stand in for heart disease and inflammation. A better marker does not always mean better health.
  • •The PubMed record has no conflict-of-interest statement.
  • •Summarized from the PubMed abstract only. The full paper may hold details the abstract leaves out.

✓ Strength– Limit• Note

These points come from fixed rules about the type of study, its size and length, what it measured, and who has a stake. Every study on Digestery gets the same rules.

Where this study sits

Each dot is one on-topic paper on this question. Steps near the top answer the question more directly.

↑ Stronger evidence

  1. Trials in people: heart disease

    1

    1 harm

  2. Trials in people: other measures

    0

    None among the papers we read.

  3. Trials in people: lab tests or safety

    4

    1 benefit, 3 no difference

  4. Population studies

    2

    2 mixed

    ↑ This study is the ringed dot

  5. Blood levels and genes

    0

    None among the papers we read.

↓ Weaker evidence

  • Points to benefit
  • Mixed
  • No difference
  • No direction
  • Points to harm

How it fits with the other research

The short answer to “Are seed oils bad for your heart?”

Not clearly; the evidence conflicts.

Confidence: very low. Based on 13 on-topic papers.

Read the full answer

Few other papers sit on the same step, so there is little to compare it with.

Other papers on the same step

See all 13 studies on this question

How this page was made

Label

First read of the abstract
Claude Sonnet
Independent second read
Claude Haiku
Differences settled
The reviewer corrected 4 fields after reading the abstract. Claude Opus 5.5.
Headline
Claude Sonnet, from the checked study record. A script checked its numbers and wording.
Numbers
Checked against the abstract by a script
“How much this study counts”
Fixed rules, the same for every study
Source check by a person
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