There is concern among some about plant protein not being absorbed as readily as animal protein. This is not a problem as we in North America presently eat 2 to 3 times the RDA for protein anyway. North Americans have been brain washed into believing they must get their protein from meat. Third world nations all over the globe, who get enough calories in their diets, eat little or no meat yet many of them are in excellent health from eating only plant protein. Men require about 2900 calories and women require about 2200 calories per day.
Hard work requires more.
Our bodies digest the proteins we eat, separating them into amino acids which are absorbed into our blood stream. Our bodies use 22 amino acids to make 50,000 different proteins we must have to be healthy. Our bodies can make all but 8 of these amino acids. The 8 amino acids it can't make are called essential amino acids, as we must get them from the foods that we eat. It isn't necessary to mix plant protein to get a complete protein.