Op vegan ism has nothing to do with being healthy. It is not based upon science nutrition or anything else usually needed to be proven truthful.
Frankly I'm impartial to it as my opinion should not influence others. However this is certainly a first world train of though. Ie food is in abundance here you can make that choice.
While there are certainly moral implications regarding animal rights which I do believe that they should also have rights...but these mongs don't realize that plants also feel pain release defense mechanisms. It could potentially be purely an egoist thing.
Furthermore you will never see a person from rural India, Ethiopia, Laos acting all high and mighty where they might not eat another meal for 2 weeks