Really? I didn't know this. Where did you hear this? Does everyone know this? I thought paleo man's bone density was way up from neo man's. I don't know why I translated this into healthier bones, less arthritis... Judith TM says: "I doubt that osteoarthritis, as opposed to rheumatoid, is caused by dairy or grains. The Neanderthal were plagued by osteoarthritis, and they were probably as paleo as we are likely to get."