Ketosis

Here's what wikipedia says:

Ketosis (pronounced /kiːˈtoʊsɪs/) is a state in metabolism occurring when the liver excessively converts fat into fatty acids and ketone bodies which can be used by the body for energy.

In this state hunger nearly disappears, which is why it's great from a dieting standpoint. My Dad is one of many who worry about liver damage from prolonged ketosis. However, it seems clear that short stints are not dangerous.

And, more importantly, even Dad agrees that I'm better off "risking it" if it's the only way I can lose weight. 230 pounds is not good, and I'll be 44 years old in December. Too fat to be this old, and to old to be this fat.