Two per day is not quite what the US government recommends:

Adults of legal drinking age can choose not to drink or to drink in moderation by limiting intake to 2 drinks or less in a day for men and 1 drink or less in a day for women, when alcohol is consumed. Drinking less is better for health than drinking more.

2/day is a recommended upper bound, applied on days where alcohol is consumed. Not the same as "you can drink 2/day year -round without consequence."