The glycemic index (or GI) is a measurement of how quickly a food breaks down into glucose in your body after it is ingested. (liveinthenow.com)
With obesity, you are consuming calories beyond your caloric needs, therefore having more glucose in your body that your insulin is incapable of moving it into your cells. (dietsinreview.com)
One energy needs are met and glucose reserves are filled, excess glucose in the body is literally turned into fat. (bodyunburdened.com)