I disagree with a lot of their activism, but their dietary facts are spot on. If you want to know how to eat healthy as a vegetarian, start here. (We're not vegetarians, but some of our friends are and we like to entertain with full meals.)
When my spouse was young, their family couldn't afford meat very often. This and Joy of Cooking were my mother-in-law's bibles for how to feed the family healthily during some rough spots.