From the The Universal Household Assistant or What Every One Should Know (1884):

Health — secrets for. — First, keep warm. Second, eat regularly and slowly. Third, maintain regular bodily habits. Fourth, take early and very light suppers, or, better still, none at all. Fifth, keep a clear skin. Sixth, get plenty of sleep at night. Seventh, keep a cheerful and respectable company. Eight, keep out of debt. Ninth, don't set your mind on things you don't need. Tenth, mind your own business. Eleventh, don't set up to be a sharp of any kind. Twelfth, subdue curiosity.

I love the last one: Trust us, you really don't want to know.