Is wine good for you or is it a myth? Any studies on this?

Wine is good. People who drink a glass or two of alcohol per day seem to live a bit longer than those who abstain or those who drink more. This has been demonstrated in many observational studies. As always there are confounding variables, but in general it appears so. Some believe there is more benefit with red wine, but the effect has been reported with beer and alcohol in general as well.