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Gene study (Mendelian randomization)

Gene study of 40,386 Chinese men: gene-predicted drinking linked to higher heart disease risk

Hu and colleagues · The American journal of clinical nutrition · 2022

Original title: Causal associations of alcohol consumption with cardiovascular diseases and all-cause mortality among Chinese males.

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What the study found

Points to harm

Self-reported light and moderate drinking showed lower risk. Gene-predicted drinking raised heart disease risk: HR 1.18 (1.01, 1.38) and 1.22 (1.03, 1.46) in higher thirds. Excluding heavy drinkers, risk of heart disease and of death from any cause rose 27% and 20% per drink.

The study at a glance

Type of study
Gene study (Mendelian randomization)
Who or what was studied
40,386 people · 40,386 Chinese men, 17,676 with gene data
What was tested
Self-reported drinking (light up to 25 g a day, moderate 25 to 60 g) and gene-predicted drinking
What it measured
The question itself: heart disease and death
Who has a stake
No disclosure in PubMed
No disclosure in PubMed.
Journal
The American journal of clinical nutrition, 2022
Source
PubMed record 35687413. 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: 40,386 people.
  • ✓Measured the question itself: heart disease and death.
  • •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

    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.
  • Part of the finding “Gene studies find no protection, and stroke 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
Source check by a person
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