Fruits/Vegetables do have a lot of nutrients, but they also have a lot of fiber. I usually end up taking dumps 2-3 times a day since I eat so many apples and bananas. So vegetables/fruits are not as digestible as meats. But I am proud of my six-pack. Yes, vegetarians can have six-packs. I'd be happy to show you too, but I doubt many of you care. I cannot tell you how fast meat zaps away at a six-pack, it zaps away at a six-pack faster than everything except alcohol.
But I know vegetarians do not live longer than those who eat a more balanced diet of meat and fruits/vegetables, they usually live a few years shorter. But veggie burgers do have protein and such, and they aren't as bad as some people think. Mushrooms and onions do make a pretty tasty burger.