I think that Kolata is heavily invested in the idea that obesity is biological and biological alone. What passed through my mind after I was done reading the book, was that she is presenting obesity as ulitmately being a disease like diabetes and sooner or later there will be a medical cure for it. I have mixed feeling about the concept of obesity as a disease.
In the sense that any eating caused me to get fat, I am sure emotional eating contrubuted. Along with my love of food/cooking/eating out etc etc etc. I don't see emotional eating as the sole culprit in my case.