It's not Supersize any more. They stopped that after the documentry of the same name (Supersize Me). You just go large
Personally, I'm sick of all the burgar joint's idea of french frys. I just get my burgar and my water bottle, and I'm good.
Personally, we need healthier fast food, like Yoshinoya

A beef and rice bowl with green tea and chicken soup, yumm.