But what is the glycemic index?

The glycemic index is a parameter that evaluates the hyperglycaemic effect of a food, ie the power that a particular food or meal have to raise the concentration of blood glucose after ingestion.

A food or meal with a high glycemic index rises very quickly the blood sugar and the segregation of insulin, which is responsible for transporting this sugar into the cells, where will be stored on the form of fat. It is important that we ingest foods or meals with low glycemic index to avoid weight gain. More important than eating less is to eat better.