I am not adverse to the occasional meat dish as long as the animals from which the meat is derived have been reared in an ethical and caring manner, but mostly I eat vegetarian dishes which I  really enjoy and I feel very fit and healthy from this. Humans do not need to eat  animal products to survive & our farming land would be far better employed for alternative food production . I find that one of the biggest mistakes people make regarding vegetarian food is  that they try to make it emulate meat  ,Why ?. There are an endless range of great vegetarian dishes that stand on there own merit and this is without the addition of soya or quorn. So a largely vegetarian culture could lead to greater productivity from much of our farm land, a healthy and more cost effective diet for our selves, a more agreeable existence for remaining livestock and less live stock farming could lead to an improved environment.
So where's the problem, eat a little good quality meat if you wish, be adventurous with vegetarian options and enjoy a great healthy life. Oh and Pubs, think beyond the token vegi option covered in cheese and give us some real alternatives.