1. MD's can do more healing than ND's. Diet isn't going to fix a broken leg.
2. MD's are more likely to find work than ND's.
3. I don't know what ND clientele looks like, but MD's are more likely to see sicker people on SAD. For example, the very poor. IMO you get a lot more health bang for your buck by making a very unhealthy person fairly healthy than making a fairly healthy person super-healthy.
5'0" female, 42 years old.
Started Primal October 31, 2011, at a skinny fat 111.5 lbs.
Current weight: 101.5. lbs and holding steady. Spring yardwork here we come!
Co-worker 1: Needs to lose ~50. Now he wants to start Mayo Clinic Diet. Yeesh. Give it up, man.
Co-worker 2: Needed to lose ~55. Lost 20 from stress. Started Primal in Sept, lost 20 more, but gained 10 back on a carb spree. We're working on it.