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Opinion or narrative review

Review of studies up to 2011 on omega-3 fats from fish and heart disease

Mozaffarian and colleagues · Journal of the American College of Cardiology · 2011

Original title: Omega-3 fatty acids and cardiovascular disease: effects on risk factors, molecular pathways, and clinical events.

Under review. A person has not yet checked this summary against the paper. It is written from the PubMed abstract. Until a person checks it, search engines are asked not to list this page.

What the study found

No direction

The authors say benefits look most consistent for heart disease death and sudden cardiac death. Evidence on non-fatal heart attack, stroke and atrial fibrillation conflicts. Guidelines suggest at least 250 mg/day or 2 fish servings a week.

The study at a glance

Type of study
Opinion or narrative review
Who or what was studied
general adults and heart patients, as covered by studies up to 2011
What was tested
Long-chain omega-3 fats (EPA and DHA) from seafood and fish oil, as covered by studies
Who has a stake
No disclosure in PubMed
No disclosure in PubMed. Funded by NHLBI.
Journal
Journal of the American College of Cardiology, 2011
Source
PubMed record 22051327. This page is based on the abstract only.

How much this study counts

  • –An opinion or narrative review: no new data, and no set method for choosing which studies to discuss.
  • •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

This paper is not on the ladder. It is a opinion or narrative review, and reviews and opinion pieces discuss studies that are already counted on the steps below.

↑ Stronger evidence

  1. Trials in people: heart attacks, strokes and heart deaths

    11

    7 benefit, 4 no difference

  2. Trials in people: other measures

    3

    1 benefit, 2 no difference

  3. Trials in people: lab tests or safety

    0

    None among the papers we read.

  4. Population studies

    0

    None among the papers we read.

  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 “Does fish oil prevent heart disease?”

Little or no effect in most trials.

Confidence: moderate. Based on 21 on-topic papers.

Read the full answer
  • Listed with the other papers, but not quoted in the page’s main findings.

Other opinion on this question

See all 21 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 two reads differed. The reviewer checked the abstract and kept the first read. 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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