Jaclyn Leong, DO

Dr. Jaclyn Leong is a triple boarded physician in internal medicine, integrative medicine and obesity medicine. She currently serves as the Medical Director of the UCI Health Weight Management Program, where she leads comprehensive, patient-centered care that supports sustainable health transformation.

Leong also practices at UCI Health’s Susan Samueli Integrative Health Institute, where she specializes in evidence-based integrative, lifestyle and functional medicine with a focus on obesity, metabolic health and chronic disease prevention. Her clinical approach blends conventional therapies with personalized nutrition, behavioral change and precision lifestyle interventions to support sustainable weight management and whole-person wellness.

She is deeply committed to compassionate, collaborative care and believes in empowering patients as active partners in their health journey. Leong practices root-cause medicine through a functional medicine lens, aiming to optimize metabolic resilience, preserve muscle mass and improve long-term outcomes using individualized, data-driven strategies.

She completed her internal medicine residency at the University of Arizona – Banner University Medical Center, followed by a fellowship in integrative medicine at the Andrew Weil Center for Integrative Medicine and Weill Cornell Obesity Medicine. Additionally, she has completed advanced training with the Institute for Functional Medicine (IFM) and the American Academy of Anti-Aging Medicine (A4M), deepening her expertise in systems biology and root-cause-focused care.

Recognized for her clinical excellence, Leong has been named a Super Doctors Rising Stars annually since 2023.

Services:

• Integrative Medicine
• Integrative Weight Management
• Internal Medicine

Clinical Interests:

Integrative medicine, internal medicine, weight management, lifestyle medicine, functional medicine, longevity, mental health, women’s health/ hormone replacement therapy, gut health