Follow this link to a great video of a lecture given at Stamford Uni by a professor in Nutrition who is reluctantly admitting that perhaps low carb does beat low fat.

It is certainly easy to follow and his humility at the end is charming.

What it shows is that whether you blame the results on insulin or water or satiety , low carb does better than low fat.

The reality is, whether we like it or not, our natural diet ( otherwise known as a caveman diet) is a great way to lose fat and sustain weight loss for life.

http://www.academicearth.org/lectures/battle-of-the-diets