Chief Medical Officer

William Hsu, MD

Prior to joining L-Nutra as Chief Medical Officer (CMO) on August 30th 2019, Dr. Hsu was the VP of International Programs and Medical Director of the Asian Clinic at Joslin Diabetes Center, a teaching and research affiliate of Harvard Medical School.

In his role, Dr. Hsu continues to advance the science and research that L-Nutra and multiple global research centers conduct on the Fasting Mimicking Diet® and other proprietary prescriptive formulations. Dr. Hsu also advances global awareness and adoption of cutting edge nutri-technologies such as the Fasting Mimicking Diet within healthcare practices and associations, and among key opinion leaders, health policy makers, and payers in healthcare.


Dr. Hsu received his medical degree from Mount Sinai School of Medicine. He completed his residency training in Internal Medicine at Yale University School of Medicine, and completed his fellowship training in Endocrinology and Metabolism at Harvard Medical School - Beth Israel Deaconess Medical Center and Joslin Diabetes Center.