About Mohamed F. Zeitoun, MD. Mohamed F. Zeitoun, MD is an endocrinologist / diabetes & metabolism doctor who practices at Mohamed F. Zeitoun, MD Practice located at 3800 Saint Mary Rd in Suite 101 in Valparaiso, IN 46383 (Porter County). Dr. Mohamed F. Zeitoun has 15+ years of experience in endocrinology / diabetes & metabolism medicine. Education.