When Hong Kong office worker W.K. Chan began putting on weight as a teenager, her doctor said it was due to hormonal imbalances that slowed her metabolism. She reached a peak weight of 100kg about a year ago, but has since lost 25kg.The secret to losing a quarter of her weight? Chan, who asked not to be identified by her full name, was one of the city’s first 200 chronic obesity patients to receive access to a new weight loss drug, originally developed for diabetes. At a cost of HK$2,700...