It's important to note that there is no requirement at all for animal protein in the diet. There is plenty of protein in beans, grains and vegetables, as well as the concentrated protein in seitan ('wheat meat') and soy products, such as soymilk, tofu, tempeh and various meat substitutes, all of which are found in any natural food store or in the health-food section of grocery stores.
Decades ago, nutritionists thought that only meat provided 'complete' protein - meaning all essential amino acids - while plant foods had to be carefully combined to provide all the necessary amino acids. The fact is, a varied plant-based diet provides complete protein without any special combining.
Wheat gluten, also called seitan (pronounced SAY-tahn), wheat meat, wheat-meat, wheatmeat, gluten meat, or simply gluten) is a foodstuff made from wheat gluten. It is made by washing dough made from wheat flour in water until the starch is rinsed away, leaving only the gluten, which can then be cooked and processed in various ways.