I found this article written by a very famous doctor, John McDougall MD, who though he would be considered a vegan doesn't like people to refer to him as such. (He even makes a point of having a slice of turkey on Thanksgiving to prove it). He says he advocates a Starch-Based Diet. He doesn't seem politically or spiritually motivated to be vegan, it seems totally health motivated. He suffered a horrible stroke at 18 because of a cholesterol level that was near 400. He was very overweight, but in med school he interned with Japanese docs in Hawaii and noticed how they were all so slim and ate mostly rice. He followed suit and lost weight and dropped his cholesterol to 150. Unfortunately, he still walks with a slight limp due to his stroke at 18. I think he is in his 60's now.
I could never be vegetarian, because I love cream in my coffee and an occasional burger, but I love that Dr. McDougall advocates for GRAINS. They have received such a bad rap since the Low Carbers hit the scene. If God Himself deigns to come to us in the form of bread and wine (and not steak and wine) well then, I think there is very important lesson there: Bread is the staff of Life (both physical and spiritual).