The roots of functional medicine can be traced back to the reputable Sir William Osler, who was one of the first professors at the Johns Hopkins School of Medicine.
“Functional Medicine is a personalized, systems-oriented model that empowers patients and practitioners to achieve the highest expression of health by working in collaboration to address the underlying causes of disease.”
See more at: http://www.functionalmedicine.org/What_is_Functional_Medicine/AboutFM/