The Glycemic Index is a ranking of carbohydrates from 0 to 100 based on how quickly and how much they raise our blood sugar levels after food has been eaten.
Low GI foods produce a slower and lower raise in blood sugar levels and high GI foods produce a faster higher rise in blood sugar levels.
Low GI foods have a GI of less than 55, medium GI foods have a GI between 55 and 70 and high GI foods have a GI greater than 70.
So why is the glycemic index so important? Consuming low GI foods make you feel full for longer it means you don't have to consume as much food which allows you to control your weight much better. High GI foods breakdown really quickly and your body is left feeling hungry again and that could lead to more eating or over eating.