What are some pros and cons of becoming a vegetarian and how do they effect your lifestyle?

I think it helps promote an overall betterlifestyle. Granted, in today's busy lifestyle sometimes it is hard to not eat processed meats or processed dairy foods but with proper planning you can successfully implement a vegetarial lifestyle without cutting out all of your meats. One great way to start is with getting vegetables with meals instead of fries or baked potatoes. A nutritionist spoke on the Today Show today about even changing baked potatoes out for baked sweet potatoes. My question would be if someone who is physically active or who works out would be okay not consuming the large amounts of protein typically found in most meats?