THIS FALL, the National Institutes of Health will launch a major study to determine whether regular consumption of alcohol helps prevent heart attacks. The clinical trial will comprise nearly 8,000 participants, recruited from 16 sites in North and South America, Europe, and Africa. The volunteers will be randomly assigned to one of two groups: Those in the first group will have one drink each day, while those in the other group abstain. This enormous study will come with an enormous price tag: more than $100 million.If you're like me, news of the planned NIH study may make you wonder: Does...