I'm sorry, I should have clarified

I eat about 3000 calories per day normally, and now I only eat around 2000. I am into competetive swimming, so it ends up being about 400 calories left over at the end, as I burn about 2000 calories per workout

I've been swimming for years, and never lost weight until I started smoking more often as of late. I would never (nor could ever) eat only 400 calories per day. But I believe it does supress hunger.