https://www.google.ca/amp/nationalpo...2-8a38aaf1ede6
According to this study, men need 2 drinking nights a week to stay healthy.
Honestly though defining someone who has 5 drinks once a week as having a drinking disorder reeks of Puritanism. The neighborhood pub isn't a new phenomena and society is hardly reaching some new level of alcoholism. People are probably drinking more because they are less likely to have kids or get married now.