What does the glycemic index measure?

The glycemic index specifically measures how quickly a particular food causes blood glucose levels to rise after it is consumed. This index ranks foods based on their carbohydrate content and the rate at which they affect blood sugar. Foods with a high glycemic index are rapidly digested and absorbed, leading to a swift escalation in blood sugar levels, while those with a low glycemic index are digested more slowly, resulting in a gradual increase in blood sugar.

This measurement is particularly relevant for individuals managing diabetes or those seeking to maintain stable energy levels. Understanding the glycemic index can help individuals choose foods that support healthy blood glucose management. The other options relate to different nutritional aspects—calorie content, fat content, and protein quality—none of which pertain to the specific measurement of blood glucose levels as indicated by the glycemic index.