Yay, necroposting!
The way I see it, a real "one-with-nature" druid(ranger) should only be eating fresh fruit and vegetables, perhaps water. No bread or cheese or milk, eggs or meat, no cooked food at all. (I don't know how it's called in English; not vegans, right? Because vegans seem to eat bread). It's much more fun this way.
But D&D creators may well have a different opinion, and more power to them. We are not speaking about some universal druids, it's D&D druids, so it's okay if Jaheira tries some fried chicken once in a while, right?
You're thinking of "Raw Foodists".
-