Just the other day, my vegan mate started questioning me about my dietary and lifestyle choices ...   "Why do you even eat meat?" "Do you think it's ethical to consume animal products?" "Why should animals have to suffer and die just so you can eat a steak or a pork chop?" "Don't you know that global warming is in part caused by livestock farming and the transport of animals and their products?" "Do you realise that studies have shown that the human body can get all