You will note that we adults only require 2-3 servings of "meat and alternatives" per day. That's right. For non-meat eaters, that means as little as 1.5 cups of tofu or beans per day. And let's not forget our dear friends tempeh and seitan. Piece of friggin' cake. We also need two servings of "milk and alternatives." Soy milk easily fits the bill. The bulk of our diet is supposed to come from fruits and vegetables and grains. Really, the vegan diet conforms more to the recommendations of the Canada Food Guide than the standard North American diet that makes a rather large chunk of meat the centrepiece of each meal. I'll leave you with this tidbit of advice from the Food Guide:
Mission accomplished.