Doctors and dietitians wedded to old nutrition paradigms and dietary guidelines want you to believe that obesity is the result of gluttony and sloth; that all you have to do to shed adipose tissue (the medical profession’s euphemism for excess body fat) is to eat less and move more. Canadian nephrologist Dr Jason Fung says that’s a recipe for starvation. Fung joins growing numbers of doctors and scientists who don’t have links to vested interests in food and drug industries and who say the science is there to show that you really can’t outrun a bad diet. They aren’t saying exercise isn’t important. Of course it is for stamina, toning and cardiac fitness. It just isn’t an effective weight loss tool.