Gittin 70 - Healthy living
Healthy living: eat 1/3 of the stomach's capacity, drink 1/3, and leave 1/3 of the stomach's capacity unfilled. If you get angry after a meal, you will be filled to capacity but not become ill.
One who is impotent should bring 3 vessels of 3 reviit (~3 ounce) of saffron that grew in a field fertilized with sheep manure, grind them up, boil them in wine and drink. Rabbi Yochanan said, "It is exactly this which made me like a teenager again."
Three things drain a person's strength: anxiety, travel, and regret of sin.