The Glycaemic Index is based on a food's overall effect on blood sugar levels. Foods with high G.I. are absorbed quickly so the amount of glucose (sugar) in the bloodstream increases rapidly. You get a big buzz but it falls off quickly leaving you feeling hungry again sooner. Foods with a lower G.I. are absorbed more slowly and release glucose gradually, indicating they are the healthier choice. Low G.I. foods may assist weight loss as you don't feel so hungry as the foods keep you satisfied longer - helping you cut down without the 'starving' feeling.