Some supermarkets are starting to label foods with their GI level. This is a measure of how quickly the energy is released from food into the bloodstream.
Choosing foods with a low to medium GI will help to avoid highs and lows of sugar levels in the body and therefore support a feeling of being sustained for longer.
A high GI measure (70 - 100) means that the energy is released quickly and causes the blood sugar levels to increase quickly. A low GI measure (less than 55) means energy is released more slowly and allows for a more sustained availability of energy for the body.