Chief Medical Officer
Dr. Mark Holthouse, MD
Dr. Holthouse, MD, IFMCP, is board-certified in family and integrative medicine and a Certified Functional Medicine Practitioner. Passionate about delivering proactive, patient-centered care, Dr. Holthouse focuses on addressing root causes rather than merely managing symptoms. Frustrated with the limitations of traditional medicine, he transitioned to a healthcare model that prioritizes prevention, cures, and lasting wellness over simply prescribing medications. Dr. Holthouse is dedicated to empowering patients to achieve optimal health through personalized and holistic approaches.
Specialties
Hormone Optimization
Age Reversal
Insulin resistance, pre- diabetes, and type 2 diabetes
Fatty liver disease
Cholesterol and blood pressure abnormalities
Preventive cardiology and cardiovascular risk
Metabolic Weight Loss
Peptide Therapy
GI and Digestive Disorders
Long Covid
Heavy Metal Detox
Autoimmune
Mold, Lyme, Mast Cell Activation Syndrome
Loyal
Mentor
Integrity
Empathetic
About
Dr. Mark Holthouse, MD
Credentials & Certifications
Medical Doctor, Board Certified in Family Medicine and Integrative Medicine
What do you do on your free time?
I’m an avid mountain biker, dual-sport off-road motorcyclist, and enjoy hiking, sailing, kayaking, and skiing. I also have a passion for Thai food and photography. My wife, Tammie, and I love spending time with our two sons and their wives, enjoying all these activities together.
What brought you to the world of functional medicine?
I got into functional medicine because I wanted to take a more proactive approach to care, focusing on prevention and addressing problems before they started, rather than just reacting to them. I grew tired of simply dispensing medications and felt compelled to be part of a true healthcare system—one that prioritizes health and healing, not just disease management. My goal has always been to understand and address the root causes of illness, shifting toward cures and prevention rather than simply naming a condition and prescribing a corresponding medication.
Where is your hometown?
Lodi, California
Training Institutions
University of California Davis Health
David Grant Medical Center
Loma Linda University School of Medicine
Dr. Mark Holthouse MD is the Chief Medical Officer for FMI CENTER FOR OPTIMAL HEALTH & FUNCTIONAL MEDICINE OF IDAHO. He graduated from Loma Linda University School of Medicine and went on to obtain his Family Practice training at UC Davis Medical Center while in the Air Force Scholarship program at David Grant Medical Center, Travis AFB. “Dr. H” has over 32 years of family practice experience and brings years of practice in the areas of Functional/Integrative Medicine. As part of the Institute for Functional Medicine teaching faculty, he has educated thousands of practitioners in hormone health across the nation over the past 10 years. As an assistant professor of medicine on the teaching faculty at Loma Linda University School of Medicine, he is an expert on cardiometabolic diseases prevention, reversing type 2 diabetes, heart disease, high cholesterol, obesity and metabolic syndrome. In addition to his clinical and teaching experience, he has 30 years of owning his own private practice as acting medical director implementing strategic models in clinical practice and the business of Functional Medicine. Dr. Holthouse and his wife Tammie enjoy photography, snowshoeing, skiing, sailing, hiking, kayaking and good food of course!
Areas of Expertise:
• Expertise in both Men's & Women's Hormone Management and Bioidentical Hormone Replacement Therapy: pellets etc.
• Expertise in thyroid and adrenal gland imbalances
• Expertise in reversing pre-diabetes, diabetic medicine, metabolic syndrome
• Optimizing body composition: lean muscle and belly fat removal / Intermittent Fasting
• Expert in managing cholesterol, cardiac, and blood pressure from a holistic perspective
• Expertise in anti-aging and cellular senescence management
• Expertise in environmental medicine: heavy metals, mold diseases, Mast Cell Activation Syndromes
• Expertise in holistic approaches to autoimmune and gut health
• General Functional Medicine