I survived one of these and have vented on here about it before. Warning signs include aversion to exercise (duh) and a general lazy, "do it for me" attitude. After you sign the papers they lose their inhibition to unhinge the jaw, explode like a supernova, then whine about you not wanting to fuck them because they are disgusting. Personally watching someone you thought you cared about go from 5'3, 110 lbs to over 200 lbs over the course of a 2.5 year marriage is a disturbing experience. According to FB pics she no longer has a neck and has probably almost reached 300. I lost everything in the following divorce (sleeping on the floor of an empty apartment, etc) but holy shit it was worth having to replace all my material possessions to be rid of that stupid lazy cunt.