I'm awfully fond of the advice to drink wine in moderation. It introduces us the non-intuitive understanding that many things in nature have an inverted U relationship: A little bit is good, adding some more doesn't improve outcome, but high levels of the same "healthy" substance make it toxic and not healthy at all. Vitamins behave this way, so does homework. Why, even too much honesty can turn you cruel.
So "some is good, more is not better" is a common principle of healthy lifestyle.