The glycemic index may not accurately predict individual glucose spikes.

“Different people glucose spike to different foods. It's hard to predict on the basis of something like a chart of glycemic index for instance. Um, so if I understand correctly and I have glanced at those papers, um, you know, I might be able to eat mango with nothing else and my blood glucose doesn't go out of range or at least not for very long. Whereas somebody else might have a a very big and prolonged spike in blood glucose to mango, but maybe there are things they can eat that I can't eat like I don't know, sourdough bread or something.”