> Additionally, fad diets tend to de-emphasize the importance of sports (as they oppose to the very traditional diet regime of "eating less and doing sports"),

> Additionally, fad diets tend to de-emphasize the importance of sports (as they oppose to the very traditional diet regime of "eating less and doing sports"), which cause an impact on the muscle mass. That'a interesting, because I've read several places that exercise is almost antagonistic with respect to weight loss. Basically doing sport increases appetite, and it's really easy to eat more extra calories than you burned during a workout. On the other hand, diet alone can be very effective at managing weight.