First off, steak and bacon and pork taste delicious, and life on rabbit food is not, in my opinion, worth living.
Second of all, the only way that I can maintain anything close to what the literature says should be a healthy weight is when I slash grains out of my diet and eat low carb, high fat, supplemented by green vegetables. Any vegetarian diet's benefits pale in comparison to the threat of diabetes and general wear and tear from carrying extra weight around.