you ask for a long term vegan i give you an example of one not good enough lolThat's all fine but you show me the research saying that ....Here's a good example some people have smoked cigarette's since they were very young too all the way into there 90's and lived healthy complete life's....We now know better that cig's are not good for you and that is not the case for most people ....My doc report's have not changed since I stopped smoking the only thing that has changed is he does not tell me I should stop smoking. Guess my point is 15 years from now and same with your buddy your body's nutritional need's will change....