this whole topic just makes me nuts, and I am so grateful Dr. Mac is updating us. I'm one of the scaredy-cats who switched to Purina Proplan. And I find to my chagrin, my dogs have lost weight on it - I did not consider the calorie count, and it is much less than the Wellness. So now I need to feed more volume and hence buy more dog food from Purina. Otherwise I have no complaints about the food, but of course I have doubts.... they did so well on the Wellness. Having been a nurse for 21 years I can testify to the drug companies sponsoring Continuing Education, and free samples with the Docs, etc. It's the same in human medicine. Man, it doesn't seem too much to ask to be able to trust ALL these companies to make a decent product that doesn't harm our pets.