It is the Glycemic Index diet. Based on eating foods that are lower in starchs, sugars etc. I guess it works on the principal that lower glycemic foods don't cause the peaks and valleys like sugars do etc.
I have been reading some information on it and it seems like it could be relatively close to core.
Was designed by a Dr. that used to be the head of the Heart and Stroke Foundation in Canada.
I am going to do some more research on it as it seems quite interesting and quite well received by the medical community as being a "good" program.
I am trying to re-evaluate what I have been eating and see if my choices are what is causing my plateau for the past few months.