I would like to bring up the Paleo diet, if as an alternative to the vegan/vegetarian option. I have always believed that mankind was in its natural form to eat meat.
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The Paleo Diet is an effort to eat like we used to eat back in the day…WAY back in the day. If a caveman couldn't eat it, neither can you. This means you can eat anything we could hunt or gather – meats, fish, nuts, leafy greens, regional veggies, and seeds. Sorry, the pasta, cereal, and candy will have to go!
There is more to it than that, but at its simplest, it's greatly reducing or actually eliminating carbs amd sugars, and really focusing on protein. (Chicken and fish. Chicken for breakfast.) Please note that veggies are encompassed, and that the greens are supposed to the the best, including legumes.