I am a meat eater. However, I also believe we the human beings in general eat foods we aren't supposed to eat. I mean that is not suitable for our natural organism. For example meat and milk. Please note that I am no expert. This is stuff I have read around and heard people say it so if anyone have better or more accurate information please let me know. Anyway, I read somewhere our teeth aren't for meat eating and our stomach can hardly process raw meat. I don't know if our ancestors (the one in the caves) ate raw meat or if the cooked in the fire. I seem to believe they did the later, but I think we mostly cook the meat to be able to chew it and digest it.
A similar thing happens with milk. When I was diagnosed being allergic to milk and derivates, the doctor told me my reaction was a natural one. He said the human organism is not made to process cow milk, that cow milk is for the calves, period. Hence many human infants do not tolerate cow milk. That's also the reason why the milk is pasteurized and put through a lot of processes before being made available to consumers. And those who own cows and enjoy milking them have to boil it before drinking the milk. He explained we need not to rely on milk for calcium. Broccoli, for example, is a good source of calcium. According to him, milk tends to do more damage than good even on people that are not allergic to it. He says it increases mucus production and it is the major cause of sinusitis. I don't know if this information is true. I know there are many groups out there advocating against milk and maybe he happens to suport them, but he certainly made me feel better!