What are the major sources of non-meat protein that are found in seitan, tofu, and tempeh?

Those are all materials made from soy beans ... a rich source of
protein.  We generally don't eat soy beans in their original state,
mainly because most people find them yucky, and their taste must be
camouflaged for them to be palatable.

Tbh idek this app is cool i love it

Each gram of carbohydrates and proteins yield 4 calories / gram . the more the calories a food has the more energy it provide to you body.