willibrord

Its a common technique to characterize any expert you disagree with as a quack. I can see it having some validity with people like the Health Ranger. Dr. Lustig ,in contrast, is Professor of Pediatrics in the Division of Endocrinology at the University of California. He is somebody who has come to his present point of view from years of research.

You shouldn't accept his points merely because of his credentials, but you should engage with his arguments and refute them on the basis of facts.