Vegetarians get up to 57 percent less heart disease. The National Cancer Institute state that eating vitamins A,C and E from fresh fruit and vegetables reduces cancers and heart disease. None of these antioxidants are in meat. A vegetarian diet provides all the nutrients you need for good health - so says the British Medical Association and US goverment. There are virtually no laws to protect farm animals from cruelty.
Meat is an incredibly wasteful way of producing food.
On average just to produce 1 kg of meat, 10kg of vegetable protein is used. That vegetable protein could be fed directly to people instead. This leads to starvation because people in the wealthy West use so many of the world's crops to feed their farm animals. And because the West has so much power it can insist that poorer countries grow food for the West's animals when they could be growing it for their own people. If everyone in the world went vegetarian we could feed the whole world and more.