Eat better... or else?

More about breastfeeding.. I'm very one track mind these days. Apparently, if mom is lacking a nutrient in her diet, her body won't just make milk lacking that nutrient. It will make as much high quality milk as it has supplies for, and then not make more. So, I guess I have to start making sure I'm eating a balanced diet? I'm not sure I know what one looks like. I'll have to remember to ask my doctor if my prenatal vitamin can help with that.