Associations between moderate alcohol consumption, brain iron, and cognition
An analysis of whether “moderate” alcohol intake (even within current guidelines) is linked to higher iron in the brain and, in turn, to worse cognitive performance.
- Using nearly 21,000 UK Biobank participants with brain MRI, the authors found that people drinking more than about 7 units of alcohol per week had higher iron levels in several deep brain regions (especially the basal ganglia), compared with lighter drinkers.
- Higher brain iron was associated with poorer performance on tests of processing speed, executive function, and fluid intelligence, suggesting a pathway from “moderate” drinking to subtle cognitive decline.
- Blood markers suggested that alcohol also disrupts systemic iron handling (higher liver iron, altered ferritin and transferrin saturation), which may partly explain the brain findings.
- Mendelian randomisation analyses supported a likely causal effect of alcohol on higher systemic iron, and of higher systemic iron on brain iron, although they could not fully rule out residual confounding.
- These findings suggest harms may occur even within current guideline limits, raising questions about whether existing ‘low‑risk’ thresholds adequately protect brain health.
Source: PLOS Medical
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An analysis of whether “moderate” alcohol intake (even within current guidelines) is linked to higher iron in the brain and, in turn, to worse cognitive…
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