Why is the insulin curve higher and sharper for the high-glycemic-index foods?

Because the high glycemic index food promotes faster release of the insulin in the blood.

Explanation:

The faster release of the insulin in the blood creates disturbance in hormone balance and pancreatic function.

The glycemic index is an indicator of how much grams of available carbohydrate in a food (excluding fiber) increase blood glucose, in reference to pure glucose.

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