How do amphetamines help facilitate weight loss?

How do amphetamines help facilitate weight loss? Amphetamines have been used in the past as a drug or pharmaceutical agent to help patients lose weight and the way to do this is by basically ramping up metabolism and metabolic rate and also by curbing appetite. However, over many years, we have learned about the deleterious side effects of amphetamines, particularly on blood pressure and heart function. And as a consequence of that, these drugs are now no longer prescribable for weight loss in the modern world. There can obviously be gone hold off using illicit means but certainly I wouldn't recommend that to anybody because the chances of causing harm to health certainly outweigh any weight loss.