The conventional diet guidelines suggest that humans should acquire a large amount of their protein quotas from meats and animal sources like chicken, eggs, etc... unlike a pure vegetarian diet which acquires its intake from plant protein sources.
Can the pure vegetarian (vegan) diet provide enough protein for sound human health?
The medical community agrees about the distinct health advantages of a pure vegetarian diet, but the protein question stays with us because animal products have been promoted by the industries that produce them, sell them, and want people to think of them as the best source of protein. This assumption is wrong and can be harmful, as a quick study of the facts about daily requirements of protein and nutrition shows.
The Importance of Protein
Protein is essential to human health. Our bodies—hair, muscles, fingernails, and so on—are made up mostly of protein. As suggested by the differences between our muscles and our fingernails, not all proteins are alike. This is because differing combinations of any number of 20 amino acids may constitute a protein. In much the same way that the 26 letters of our alphabet serve to form millions of different words, the 20 amino acids serve to form different proteins.
Amino acids are a fundamental part of our diet. While half of the 20 can be manufactured by the human body, the other 10 cannot.*1 These "essential amino acids" can easily be provided by a balanced vegan diet.