Weight loss does not differentiate between fat or muscle! The devil is in the detail! Did the fat change into muscle or not? The study doesn't state either. Arnold Schwarzenegger used to exercise and throw up, during military basic training or sports training, its not uncommon to have things like runner's diarrhoea, vomitting in the gym, there is a lot of vomiting in the gym on base here. Vomiting is the bodies way of purging the digestive system to benefit the exercise being undertaken. Elite Athlete's know this so it sounds like L-Carnitine can be beneficial over time. It used to be known as Vitamin BT until it was discovered the body makes it, but it declines with age and inactivity.