Milady Alluca
I think Vegan is an extreme diet and individuals should consult their doctor and/or a professional nutritionist to first make sure their body can survive at full capacity on such a diet, work out a transition plan, and then a full diet plan that covers how to get all the proper nutrients and vitamins and junk necessary.
But I would never do that s**t unless it was literally a life or death situation, I like McDonald's Chicken Nuggets too much, I'll never quite them.
I agree, one should consult professional opinion on if a diet is safe in relation to their own physiology, and see a dietitian to set up a meal plan to maintain as close to optimal nutrition as possible on any unusual diet. Particularly if such individual is not confident in his/her knowledge about nutrition and biology. This would insure that the mass majority of people who drastically want to change their diet would not end up in failure. In fact, I would claim that most, if not, all people who fail on a vegan diet due to adverse health effects was due to lack of structure and lack of knowledge.
There are even physicians with an N.D. degree and most dietitians who are more open to the idea and actually more educated on the matter.
I don't eat McDonald's anymore but when I did man, the chicken nuggets and the egg Mc muffin was the s**t. lol
But anyway, my second claim is that not only would people not fail on a well structured vegan plan, but would be providing their body with an optimal dietary regimen in respect to their general and specific human adapted biology.