Foods such as white rice, sugars, white bread, Fine flour (Maida) and preparations thereof contain simpler sugars and rapidly raises your blood sugar levels. Foods having complex carbohydrates slowly release glucose in the body and hence provide sustained energy over a longer period of time and help curb the hunger too! The glycemic index, or GI, measures how a carbohydrate-containing food raises blood glucose. Foods are ranked based on how they compare to a reference food; either glucose or white bread. Foods having complex carbohydrates take much longer time to get soaked.