I'm up for people eating or not eating whatever they like. What I'm not up for is anyone crusading to tell me what I shouldn't be eating. If everyone on the planet went vegan, agriculture would collapse in third world countries and huge areas of marginal land suitable only for grazing would go to waste. There would also be a massive demand created for artificial chemical dietary supplements. Well whoop-de-bloody-do. If you want to be vegan, good for you. But for the planet it's an insane philosophy.