自从制药公司开始测试减肥药以来，问题一直是：人们减掉多少体重？现在问题正在转变为：他们减掉的是哪种体重？
For as long as drugmakers have been testing weight-loss drugs, the question has been: How much weight do people lose? Now it is changing to: What kind of weight are they losing?
快速减重可能带来副作用——人们可能因失去大量肌肉而受伤或易跌倒。
Rapid weight loss can come with a downside—people can end up injured or prone to falls if they shed significant muscle alongside fat.
制药公司正在测试一代新的肌肉保护和体脂靶向药物来解决这个问题。
Drugmakers are testing a new generation of muscle-protecting and body fat-targeting drugs to fix that.