Umm, lets see. My body was designed to eat meat. You should see how I react to a lack of protein... I tried to be a vegitarian and it was a nightmare. I spent a whole month vegan too. It cleaned me out, I felt refreshed when it was over, but I was constantly tired and it never went away. Here is what I know for a fact about nutrition. There are certain amino acids and fats that you cannot live without. Whole vegitarian foods can provide them, but it's tough to get enough. There is no such thing as an esential carbohydrate, and our bodies are designed to have a contingencey plan for lack of carbohydrates. prolonged lack of essential amino acids will kill, and definately makes people sick. You can see it everywhere in 3rd world countries. i know a professor at school, she's 50 and a vegetarian... qualified for the Boston marathon last year. pretty amazing IMO My colleague has run in the 50 and over class three times now and has placed 3, 4, 8 in the Boston...and he's also a vegetarian. makes me feel like a fat piece of shit when i see all these healthy people running around... Makes me feel tired