The use of alcohol in this study is a little tricky. It is clear that the mortality risk was highest for people who didn't drink at all and for people who drank all too much—and clearly lower for people in between, who drink in moderation. For the purposes of this study, anywhere between one and 14 units of drink weekly was considered in the healthy range. (A single unit might be a half-pint of beer, a glass of wine, or a small shot of whiskey.) In the United States, the upper limit for "moderate drinking" is two drinks daily for men and one drink daily for women. In the United Kingdom, the recommendations are a little looser: up to 21 drinks weekly for men and 14 drinks weekly for women. In other words, there's no international consensus. Personally, I'm not sure where I'd draw the line for moderate drinking, but I'm pretty sure it would be south of the U.K.'s standard.