From Dr. John McDougall http://www.drmcdougall.com/ : "The short answer is, if you eat a well rounded starch based, plant based diet, you don't have to worry about it. Plants have all the protein you need. In fact, too much protein from a meat based diet taxes your kidneys, bones, and other organs." The picture is Dr. McDougall's family. Click on it to read what it says on their t-shirts. Then please click on the following link and watch the short video from Dr. M re protein: http://drmcdougall.com/video/mcdougalls_moments_protein.html