I would second the kellymom information, though I have to say I eat whatever I want (and have). DS seems to be thriving (over 30 lbs. at a year), so it wasn't a big concern.
One more thing: my doula gave me some good advice right before giving birth, and that was not deliberately NOT cut out anything you would normally eat UNLESS it started to cause a problem for DC. I'm glad she said that. BFing was stressful enough in the first few weeks, and if I had felt that BF was a "sacrifice" in terms of diet, I might not have been as inclined to continue (there was enough sleep-sacrifice in the beginning... though that was more because I didn't feel comfortable co-sleeping... had I to do it over again, that would have been different... but that's a whole 'nother story).