This educational research summary does not replace individual medical or nutrition advice.
Original research title
Refining Genetic Instruments for Dietary Intake Mendelian Randomization Using Phenome-Wide Association Studies
Only about 20% of reviewed studies used functionally plausible genetic instruments. In the alcohol–liver-enzyme example, instrument choice changed the direction of the result.
Genetic data alone do not establish a food's effect. A marker may influence health through pathways unrelated to that food.
This is not a dietary trial. Conclusions depend on instrument assumptions and underlying data; its fish and alcohol examples do not independently justify consumption advice.
Published methodological study; useful for critical reading, with caution about causal claims.
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