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Alcohol and Cardiovascular Health
The substantial medical risks of heavy alcohol drinking as well as the existence of a safe drinking limit have been evident for centuries. Modern epidemiologic studies also show lower risk of both morbidity and mortality among lighter drinkers. Defining "heavy" as > or =3 standard drinks per day, the alcohol-mortality relationship is a J-curve with risk highest for heavy drinkers, lowest for light drinkers and intermediate for abstainers. A number of non-cardiovascular and cardiovascular problems contribute to the increased mortality risk of heavier drinkers. The lower risk of light drinkers is due mostly to lower risk of the most common cardiovascular condition, coronary heart disease (CHD). Thus, disparate relationships of alcoholic drinking to various cardiovascular and non-cardiovascular conditions constitute a modern concept of alcohol and health. Increased cardiovascular risks of heavy drinking include: 1) alcoholic cardiomyopathy, 2) systemic hypertension (high blood pressure), 3) heart rhythm disturbances in binge drinkers, and 4) hemorrhagic stroke. Lighter drinking is unrelated to increased risk of any cardiovascular condition and, in observational studies, is consistently related to lower risk of CHD and ischemic stroke. A protective hypothesis for CHD is robustly supported by evidence for plausible biological mechanisms attributable to ethyl alcohol. International comparisons and some prospective study data suggest that wine is more protective against CHD than liquor or beer. Possible non-alcohol beneficial components in wine (especially red) support possible extra protection by wine, but a healthier pattern of drinking or more favorable risk traits in wine drinkers may also be involved.