This equals out to lower and more controlled blood glucose values. Whereas other people, like the woman you mentioned who had to live for three years with aluminum foil around her, would be put down and out if she was inhaling acetone. Observations like this make it plausible that vitamin C could improve glycemic control in type 2 diabetes. In general, a glycemic load of 20 or more is high, 11 to 19 is medium, and 10 or under is low.