So What is the Link with Weight Loss?

The theory behind diets based on the Glycemic index is that food with a low G.I value releases sugar slowly into the blood stream, providing you with a steady supply of energy, ensuring you feel satisfied for longer and preventing you from grabbing a high cal snack.

Foods with a high G.I value cause a rapid, but short-lived, rise in blood sugar. This leaves you lacking in energy and feeling hungry within a short time, with the result that you end up reaching for a snack. Ultimately this will cause weight gain.