Your body is nothing but a vast community of 'parasites'; good and bad.
Most bad parasites feed off the residues of our modern processed foods, or are resilient to our allopathic medicines. Trust me, our bodies really do want to be healthy by eating natural foods, thats how we evolved for millenia.
There is nothing wrong with eating raw meat as long as you are reasonably healthy, and have access to quality meat. When its fresh from the kill-liver & kidneys taste darn near to steak, but I've never been much of eating a creatures used 'oil filter' (you don't put a used oil filter back on your car after the oil change do you?)