Shock findings suggest that there is no such thing as a generic fattening food, it depends on the body of the person eating it. Read about it here: bbc.co.uk/news/magazine-351.... "Trust me I'm a doctor" on the BBC will discuss this tomorrow night or you can see it on i-Player.
I guess we who try to eat in a healthy way work this out for ourselves to some extent: we find out by trial and error what works for us and what hinders our weight loss.