What should and shouldn't vegetarians eat?

Vegetarians refrain from eating any product that has animals in it, including meat, poultry, fish, and Gelatin. Strict or pure vegetarians (also known as vegans) also refrain from eating anything that comes from an animal, including dairy, eggs, and honey.

That leaves plenty of healthy food, including fruits, vegetables, grains, legumes, nuts, seeds, and mushrooms.