This is horrible advice.

Just because something has been done a certain way for a long time does not mean it's something we should continue. In a lot of cases it just means we didn't have the knowledge that it was so bad for you. And that's exactly where alcohol fits in. We know alcohol is bad for us in just about every way. So there's really no such thing as "under drinking".

Cigarettes. Cocaine. Tanning. Not wearing seat belts. Not wearing helmets. Beating kids as punishment. Bloodletting. X-rays. I mean the list is just endless.

Folks should do as they please. I'm not suggesting everyone needs to stop drinking or anything. But to suggest that "perhaps also be cautious of under drinking as well" is just downright wrong.