It appears that the more alcohol a person consumes the less likely he or she is to have a good diet. Dr Rosalind Breslow and colleagues at the US National Institute on Alcohol Abuse and Alcoholism also point out, in the American Journal of Epidemiology, that healthy habits tend to go together, and so it is difficult to tell how much of alcohol’s beneficial effect on the heart is due to the way moderate drinkers tend to eat and how much to moderate drinking.