Vegans are at no risk of getting a protein deficiency

Please study this:
http://www.adelicatebalance.com.au/ and this:
http://drmcdougall.com/misc/2007nl/apr/dairy.htm
No risk of getting a protein deficiency.
" Proteins are made from chains of 20 different amino acids that connect together in varying sequences—similar to how all the words in a dictionary are made from the same 26 letters.   Plants (and microorganisms) can synthesize all of the individual amino acids that are used to build proteins, but animals cannot.  There are 8 amino acids that people cannot make and thus, these must be obtained from our diets—they are referred to as “essential.”

After we eat our foods, stomach acids and intestinal enzymes digest the proteins into individual amino acids. These components are then absorbed through the intestinal walls into the bloodstream.  After entering the body’s cells, these amino acids are reassembled into proteins. Proteins function as structural materials which build the scaffoldings that maintain cell shapes, enzymes which catalyze biochemical reactions, and hormones which signal messages between cells—to name only a few of their vital roles.

Since plants are made up of structurally sound cells with enzymes and hormones, they are by nature rich sources of proteins.  In fact, so rich are plants that they can meet the protein needs of the earth’s largest animals: elephants, hippopotamuses, giraffes, and cows.  You would be correct to deduce that the protein needs of relatively small humans can easily be met by plants."
Please also read this article: http://bloganders.blogspot.no/2013/04/the-purpose-of-cowpighorse-is-not-to.html

If we love animals, and don't want to inflict them suffering, we shouldn't eat them: http://bloganders.blogspot.no/2013/04/the-purpose-of-cowpighorse-is-not-to.html
They have a right to live.