Dr. Joy practices endocrinology which includes seeing patients with G.O.O.D. problems (Goiter or thyroid disorders, Obesity, Osteoporosis and Diabetes) and other hormone disorders. Her clinical and research interests are diabetes, weight management, clinical nutrition, cholesterol disorders and hypertension. She is an active consultant at the St. Luke's Medical Center-Global City and heads the Center for Weight Intervention & Nutrition Services (WINS). She is also the Section Chief of Endocrinology at Asian Hospital & Medical Center. She has been certified by both the American and Philippine specialty boards.