Good idea, poor execution
There are really too many inconsistencies in the data to make this app useful. A plain banana, for example, appears multiple times, and as both a high and low glycemic index food choice.
It would be useful, if it were edited carefully, but currently it seems to be a mishmash of data from many conflicting sources.
bwbmrb about
A Low GI Diet - Glycemic Index Search, v2.0.4