About Dr. Yost

“Health is a state of complete physical, mental and social well-being, and not merely the absence of disease or infirmity.” World Health Organization Constitution 1948.


As a physician, I have seen the limitations of a medical system based on ” a pill for an ill” approach, i.e. treating the symptoms with strong medications but not addressing the underlying causes of a person’s illness. People come to see me with their own unique experience of illness and not a pre-packaged disease. They come because they want to feel better, have more energy and have a better life and if possible do this with fewer medication or possibly none at all.

I believe in the famous words of the distinguished British physician of the late 19th and early 20th century Sir William Osler, “It is much more important to know what sort of patient has a disease than what sort of disease a patient has.” No one’s autoimmune disease is the same as anyone else’s. The same goes for gastrointestinal problems, diabetes, weight issues, mood and anxiety disorders, or any other condition. This is the essence of Functional Medicine, a personalized medicine approach for each person bases on their description of how things started as well as their unique genetic and biochemical makeup . My appointments are longer than a primary care physician so I can get to know the person by hearing the story of their health concerns and also take the time to explain what I think will be helpful for them and what the tests mean.

As a physician who practices Functional Medicine, Lifestyle Medicine and Integrative Medicine, my training and experience tells me that there is a better way to address chronic health problems than hormone replacement, pain medications and diet pills. I have seen these treatments lead to false promises and frequent side effects. No one really wants to be dependent on a medication for the long term or for the rest of their lives. I have seen inexpensive lifestyle changes empower people to take control of their health and believe they can make these changes habits for life. Together, we can work towards optimum health and wellness and a long and active life.

Lifestyle Medicine is the medicine of the 21st century. Many studies document the powerful effect of lifestyle changes on all of the chronic diseases we deal with today such as heart disease, high blood pressure, diabetes and blood sugar problems, osteoporosis, stroke, cancer, arthritis, cholesterol problems and Alzheimer’s. Comprehensive lifestyle changes are shown to influence genetic expression in a positive way for hundreds of genes. Coronary blockages can regress from multiple lifestyle changes. In a recent study, early stage prostate tumors regressed from lifestyle changes such as diet, exercise, meditative stress seduction and group support. These are some dramatic examples of the power of low technology lifestyle changes. The National Institute of Health now recommends lifestyle changes not just for prevention but for actual treatment of many chronic illnesses.

Memberships: Member of the American College of Lifestyle Medicine,
American Academy of Pain Management, Institute of
Functional Medicine
, Pima County Medical Society
Graduate: Applied Functional Medicine in Clinical Practice (AFMCP),
Institute of Functional Medicine
MD: University of Nebraska College of Medicine, Omaha, NE
Award: Physician’s Recognition Award for Continuing Medical Education,
American Medical Association, 2005-2008
Teaching: Instructor with the Integrative Medicine Program at the University of Arizona College of Medicine.
Board Certifications: American Academy of Pain Management,
Diplomate of the American Board of Psychiatry and Neurology