For those who have had a close look at the common food label, you will notice that both carbohydrates and sugars are often listed. Sugar is a form of carbohydrate, so why are both listed? This is something that confuses many people.
The term ‘complex carbohydrate’ is an old one, it is still a relevant way of describing carbohydrate foods. It generally explains mainly the higher fiber content and better nutritional values of them. However, these days we generally put carbohydrates into the ‘Glycemic Index’ framework to describe its uptake and release into the blood stream. To briefly explain the difference, some complex carbohydrates are released quickly into the blood stream, while others are released slowly. Also some simple carbohydrates (historically known as refined sugars) can be released slowly into our blood system. There is more general information about GI.
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