How to decifer the “GI” and “GL” values of foods
If you want to loose weight, balance your mood, energy and hormones or treat your Diabetes naturally, you need to balance your blood sugar by watching what foods you eat and when.
Knowing the Glycaemic Index “GI” and Glycaemic Load “GL” of foods can help you achieve this. But what are they, and what is the difference between them?
The GI of a food measures how quickly the sugars are broken down and released from a carbohydrate once you have eaten it, in order to have an effect on your blood sugar levels. Rapid breakdown and release of sugars causes a huge surge of sugar into the blood stream, causing your body to respond by releasing lots of insulin from the pancreas, to pack it all away into your cells (excess sugar is stored as fat). This then causes a ’sugar crash’, and a cycle of peaks and crashes begins, which is very hard to break.
Sugars which break down quickly (such a white bread, pasta and rice, chocolate, cakes, fizzy drinks) have a high GI and foods which break down slowly (such as wholemeal bread, pasta and rice, some fruits such as berries, plain yoghurt) have a low GI.
Glycaemic Load expands on the above, and takes into account the amount of carbohydrate in a serving size, as well as how quickly it’s sugars break down. The formula is: GL = (GI x the amount of carbohydrate) divided by 100.
For example, If you cut yourself a slice of watermelon weighing 100g, with a relatively high GI score of 72 and a carbohydrate content of 5g (it contains a lot of water), you would calculate: 5 x 72 / 100 =3.6, so the GL is 3.6. A score of 3.6 is a low GL score.
Low is 10 or less, medium is 11-19 and 20 or greater is considered high.
This shows how GL is more accurate than GI, as if you just knew the GI of watermelon, you might avoid it as a food choice. However, because it is low in carbohydrate, it will not have a great effect on blood sugar and is therefore still a sensible choice.
If you search, you can find GI lists online. For more information, I would recommend the Collins Gem book “GL: Glycaemic Load Explained”.
Gl is a useful tool, but not the be-all-and-end-all of healthy eating. Remember to get enough good quality protein, and eat healthy non-saturated fats as well.

