The glycemic index (GI) looks at the impact different carbohydrate-containing foods have on blood sugar levels over a 2 hour period.  It rates foods on a scale from 1 to 100. Foods with a low GI score raise the amount of sugar in the blood at a low rate. High GI foods raise blood sugar levels much more quickly.  Because low GI foods are digested slowly, they will keep you feeling full for longer. High GI foods are less filling and often lead to sugar crashes. The glycemic index is useful for everyone, but particularly for those with diabetes. Certain fruits - like pineapples, watermelons, and ripe bananas - score highly. While these are still safe for people with diabetes to eat, it's good to know which fruits should be eaten in moderation.