I have noticed that if I lose any more than 2 lbs, my milk wanes. If I put those 2 lbs back on, I have milk! It's not like I'm starving myself. I'm trying to lose very gradually, but it seems I NEED those extra 7-10 post-preggy pounds to keep my milk up. I guess not fitting in my skinny clothes is a small price to pay for the fulfilled dream of breast feeding longer than a few months!