Glycemic Index is a number that represents, on a scale of 100, the ability of foods to increase the level of glucose in the blood. In other words, there are two kinds of carbohydrate foods: the ‘good-carb’ foods take longer to digest, and don’t cause spikes in blood sugar levels, while ‘bad-carb’ foods are easily digested and converted to glucose, causing sharp increases in blood sugar levels.
Therefore, good carbs have a low glycemic index and are healthier than bad carbs that have a high glycemic index. Check this chart to know the glycemic index of typical foods. Go lower, go healthier.
Infographic Source – Internet