"The more soup you eat, the faster you will lose weight."

This doesn't really make a lot of sense, does it ?

The soup contains calories and how does it follow that the more calories you take in the more you will lose ?

It may be that by filling up on that swill...er soup, you will not be eating all those potato chips, tostitos and brewskies, but then the weight loss would be not as a result of what you are eating but what you are not eating.

There is no magic bullet to losing weight. In order for it work in the long run requires a permanent change in lifestyle ie. changing the two variables that affect caloric balance: diet and excersise.