A new symbol was launched in Sydney yesterday [Tuesday] on some food packaging to help health-conscious consumers identify how quickly the foodstuffs make their blood sugar levels rise. The voluntary symbol, which rates food with regard to the Glycemic Index (GI), was developed by the University of NSW, Diabetes Australia and the Juvenile Diabetes Research Foundation. The GI rating of the particular food is given as high, medium or low, after the product is tested in an accredited laboratory.