A doctor who lost 40 kilograms using GLP-1 weight-loss drugs said patients must remain on the medication to maintain weight loss, citing studies that show patients regain weight if treatment stops. Dr. Jang Hyung-woo, a cardiothoracic surgeon and professor at Bundang Seoul National University Hospital, appeared on CBS Radio's "Park Sung-tae's News Show" on Tuesday to discuss his personal and medical experience with the medications. Jang said obesity threatened his health but the various methods he tried all failed before seeing results from Wegovy and Mounjaro in 2024. He said he wanted to inform other patients after seeing significantly superior outcomes compared to other treatments. After struggling with obesity since childhood, Jang peaked at 118 kilograms during his medical residency. He reduced his weight to 78 kilograms by using the drugs over a two-year period and continues with weekly injections. Earlier this year, he published a medical memoir detailing his treatment titled "Obesity Record — I Am a Doctor Who Takes Mounjaro." Limitations of traditional diets, safety thresholds J