If you're only looking at the number on the scale, then yes, it'll work. But then, if you're only looking at the number on the scale, then voluntary amputation would be a much more permanent weight-loss solution.
So yes, it's true, but why not feed your body the fuel it "wants" in order for optimum performance? I guess it depends on how serious you are about health. The thought of junk food makes me cringe for the most part, but I'm neurotic.