Many vegans I know don't eat that well and succumb, just like many people, to the fast food offerings of the food industry, who do not have your interests, or mine, at heart. Everything is profit-driven.
Also, if one has to take supplements to have a complete diet, it surely isn't all that healthy.
I also know of some who have mental health issue...related to factory food????
Sorry Preeti, I am not convinced. What I do endorse are whole foods, as close to natural as possible. People who eat whole foods seem to have fewer ailments.
The jury's out on veganism.