I read "Good Calories, Bad Calories" and that's not what he says at all. His point is that we react metabolically to different foods in different ways.  He does believe that low carb is an easier way to lose weight than simply  "eating less" but my impression is that he doesn't deny that eating less will make you lose weight. I think his point is that low carb will keep you satiated much better than simply eating less of an already shitty diet.