If you look at the sugar profiles of apples and bananas, an apple has a greater amount of fructose than a banana. The fructose to glucose ratio of an apple is about 2:1 whereas the fructose to glucose ratio of a banana is about 1:1. Also the sugar to fiber ratio of a banana is about 9:1, whereas for the apple, it is about 7:1.
Those would be my guesses for the higher GI of bananas than apples. It the end, it probably is not a matter of great concern. The GI of a banana is 52. The GI of an apple is 38. That is not a significant difference in my opinion. I don't know why bananas and fruit in general are shuned in the dieting world. Most are relatively low on the GI scale, and they are all highly nutritious.



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