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Gene study (Mendelian randomization)

Gene study of 371,463 UK adults: gene-predicted drinking linked to higher heart disease risk

Biddinger and colleagues · JAMA network open · 2022

Original title: Association of Habitual Alcohol Intake With Risk of Cardiovascular Disease.

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What the study found

Points to harm

Healthy habits among light drinkers weakened the apparent benefit. Gene-based analysis: each 1-SD rise in predicted drinking gave 1.4-fold (95% CI, 1.1-1.8) higher coronary artery disease risk. Light drinking added little risk; heavy drinking added much more.

The study at a glance

Type of study
Gene study (Mendelian randomization)
Who or what was studied
371,463 people · 371,463 UK adults, average age 57, who drank about 9 drinks a week
What was tested
Self-reported drinking and gene-predicted drinking, light to heavy, followed up to 2016
What it measured
The question itself: heart disease and death
Who has a stake
No stake declared
Author ties are to drug and gene-test firms, not alcohol makers.
Journal
JAMA network open, 2022
Source
PubMed record 35333364. This page is based on the abstract only.

How much this study counts

  • •A gene study: it uses natural gene differences as a kind of experiment. It is less affected by lifestyle than surveys, but it rests on assumptions that can fail.
  • ✓Large: 371,463 people.
  • ✓Measured the question itself: heart disease and death.
  • ✓No competing interests declared.
  • •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

    0

    Not done yet. This is the step that would answer the question.

  2. Trials in people: other measures

    0

    None among the papers we read.

  3. Trials in people: lab tests or safety

    0

    None among the papers we read.

  4. Population studies

    5

    3 benefit, 1 mixed, 1 harm

  5. Blood levels and genes

    6

    1 mixed, 2 no difference, 3 harm

    ↑ This study is the ringed dot

↓ Weaker evidence

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

How it fits with the other research

The short answer to “Is moderate drinking good or bad for your heart?”

Not shown to help; may harm.

Confidence: very low. Based on 21 on-topic papers.

Read the full answer

Of the other 5 papers on the same step: 1 mixed, 2 no difference, 2 harm. This one found harm.

  • Quoted in “What we found”: Gene studies, built to reduce bias, found no protection from moderate drinking. Several tied more drinking to higher stroke or heart disease risk; pooled gene data showed no link.
  • Quoted in “What we found”: Light to moderate drinkers had healthier lifestyles; adjusting for this weakened the apparent benefit. In Spain, analyses least open to non-drinker (abstainer) bias showed no clear link.
  • Part of the finding “Gene studies find no protection, and stroke harm”.
  • Part of the finding “Why population and gene studies disagree”.
  • Marked as a key paper in the research timeline: Healthier habits weakened benefit; genes tied drinking to harm.

Other papers on the same step

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 reviewer corrected 1 field 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
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