Appreciate that excess production of 2000L of breast milk would require the amount of excess caloric intake of 2 years worth of normal adult consumption. With grocery prices being what they are, that's something.
Windex007 is right; breastfeeding is how many new moms lose the excess pregnancy weight. But it is a delicate dance trying to keep your milk production up. Also, personally I was starving all the time while I was nursing, plus sleep deprivation, so for some of us the whole “losing the baby weight” doesn’t really work as well as we’d like.