If you haven't yet viewed Tom Naughton's excellent (and light-hearted) Movie/Documentary "Fat Head" do yourself a favour and check out this clip...
For decades we've been told gaining and losing weight is all about the calories. Just one little problem: the research says otherwise. Diabetics undergo dramatic weight changes when they adjust their insulin levels -- and so do you. Your diet determines how much insulin your body will produce over time. From the documentary "Fat Head."