It is nice to hear Mayo is warming to the idea. Unfortunately, that is all apparently based on the areas being offered-- mostly non-medical and not much based on science.
If you look at ifm.org website you will see that the folks who teach classes are mostly MD's and Phd's. The area in which I recommended someone(?) consider functional medicine also was in the area of Gastrointestinal clinical practice. There is a terrible dearth of MD's(or even ND's) who can both prescribe drugs and utilize functonal medicine. The whole point of even considering functional medicine has to do with the fact the MOST doctors(generalizing, I know) are being taught to determine the symptoms and use an algorithm or look up table or even computer to assign a "correction" whether it is drugs or therapy or whatever. There are seldom actually out there attempting to find the REAL CAUSE and eliminate the cause. That is the point of Integrative Medicine. NOW. I am an engineer not a doctor, so certainly one most consider this with a certain grain of salt. However, if you talk to enough Int. Med. DOCTORS, it is likely this will be close to their response.