That's the takeaway of a new study in the Journal of Studies of Alcohol and Drugs. Researchers sifted through 45 previous studies and found flaws in the methodology. One of them is that subjects referred to as "non-drinkers" could have actually been former drinkers who turned teetotaler or cut down for health reasons. As such, they are less healthy than moderate drinkers but not because they never touched alcohol. Their health may influence their drinking choices — in other words, they may not drink because their health is poor.