People are vegans for two reasons, animal rights and health. The ones who are mainly vegans for animal rights are usually young and became vegans in high school and college. Although most of them don't think much about the health aspect, they use health as a way to prove they are right. The others who become vegan for health reasons are older like myself and are desperate to believe anything. I was in that latter category for several years. However my health did not improve. In fact it got worse. I was in the McDougall Program which touts itself as a high starch plant-based diet rather than calling itself vegan. Although many on the program claim it has improved their health, many have dropped out and those who are still on the McDougall Program are still fat and sick, but are in denial. They swear by not only Dr. McDougall's books, but The China Study by T. Colin Campbell. I know one person who became diabetic after going on the McDougall Program and another who had to have gall bladder surgery as a direct result of that diet. I know many others who became sick, including myself. I developed anemia and muscle wasting. When I left that way of life there was a minor uproar amongst those who knew me and were still vegan. I don't even try to persuade them to change, because I know they will not listen or read anything that disagrees with their views. My best advice is to just be a good example of health and fitness.