My appetite doesn't usually change at all - occasionally (very occasionally) I might have less of an appetite when depressed but I usually make myself eat normally.

My weight is very stable and always has been (with the exception of side effects - I gained 15-20 pounds from seroquel which I had to lose, but then maintained, and I lost 15-20 from depakote, which I've since maintained).

If for whatever reason - mood, boredom - I eat too much or too little one day, my appetite compensates the next day.