Gittin 70: Don't Eat Standing Up
Talmudic ronouncements about what diminishes a person's strength - with verses from Psalms as prooftexts. Plus, what not to do while standing. Plus, an assortment of things that will bring a person to death, if done in a particular order. Also, the case of the person who has some kind of temporary insanity and the implications for a get that is commissioned by him.