Alcohol & Cognition
What even moderate drinking does to your brain
Even moderate alcohol consumption has measurable effects on your brain's structure and function. Alcohol disrupts the hippocampus (your memory hub) and impairs the prefrontal cortex (your judgment center). Recent research has challenged the older idea that moderate drinking is neutral or even protective, with newer studies finding measurable brain volume differences at relatively low levels of intake.
Where the older research saw a J-shaped curve (light drinkers seemingly healthier than non-drinkers), more recent work suggests that finding was likely a measurement artifact. The cleanest current summary: alcohol's effects on the brain are dose-dependent, and the dose-response curve appears to start at zero. None of which means a glass of wine ruins your brain. It does mean the level of "safe" intake is probably lower than the cultural default suggests.
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Alcohol & Cognition