While each of these studies has reported a cardioprotective effect of alcohol, they differ over which type of alcoholic beverage provides the greatest benefit" (634).

Overlooked in many of these studies, though, is the fact that some people who categorize themselves as being one type of drinker compared to another may engage in other activities that are unhealthy from the outset (for instance, beer drinkers may be more likely to also be tobacco users) while others may engage in a wide range of healthy behaviors (for example, wine drinkers may not be smokers and may job or exercise regularly). As McGregor and his colleagues emphasize, "One inherent difficulty within these studies is that in the general population, drinkers distinguished as primarily wine, beer or spirits drinkers tend to differ in other important aspects. If, for example, wine drinkers are found to be healthier, it may be the result of a...
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