The 22 year old that posted on water intake had a point. If i feel really hungry and shouldn't, the first thing I'll do is drink some water - your body is telling you you need something and it isn't necessarily more calories that it needs. If the feeling persists, I might eat or not, depending on the situation.
Zen is right, long after your menses stop, you are still cycling, the cycles just get better than they used to be.

A lot of you say you need more protein; but most of us (not addressing the vegans here) eat more protein than we really need.
I think my body gets bored and wants something to do. If I'm really focused on something, I get a lot less of those hunger urges. When riding, I actually have to PAY attention or I will wait too long to eat. That certainly never happens while I am sitting at work waiting for it to be lunch time.