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Gene study (Mendelian randomization)

Gene study in large databases: genetically higher blood magnesium linked to lower insomnia risk

Luo and colleagues · Medicine · 2025

Original title: Causal relations of trace elements and nutrients with insomnia: A Mendelian randomization study.

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What the study found

Points to benefit

Genetically higher blood magnesium was linked to lower insomnia risk (OR = 0.869, 95% CI = 0.763-0.990, P < .05). No other nutrient showed a link.

The study at a glance

Type of study
Gene study (Mendelian randomization)
Who or what was studied
large genetic databases (FinnGen) on blood nutrient levels and insomnia
What was tested
Whether genes that raise blood magnesium (and other nutrients) also change insomnia risk
What it measured
The question itself: sleep quality and insomnia
Who has a stake
No stake declared
No competing interests declared.
Journal
Medicine, 2025
Source
PubMed record 41305687. 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.
  • •The abstract does not say how many people took part.
  • ✓Measured the question itself: sleep quality and insomnia.
  • ✓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: sleep quality and insomnia

    1

    1 benefit

  2. Trials in people: other measures

    6

    4 benefit, 2 no difference

  3. Trials in people: lab tests or safety

    0

    None among the papers we read.

  4. Population studies

    3

    2 mixed, 1 no difference

  5. Blood levels and genes

    3

    2 benefit, 1 no difference

    ↑ 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 “Does magnesium help you sleep?”

Not clearly; trials disagree.

Confidence: very low. Based on 16 on-topic papers.

Read the full answer

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

Other papers on the same step

See all 16 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 agreed on every checked field. 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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