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Complex and simple are terms that refer to the chemical structure of the carbohydrate molecule. Complex carbs are chains of three or more sugars, while simple carbs consist of one or two sugars. Unfortunately, knowing whether a carb is complex or simple has no value in terms of its nutritional quality. What matters is how fast a carbohydrate is digested and how much it raises one's blood sugar. Some simple carbs are digested very slowly and do not raise blood sugar while some complex carbs are digested very rapidly and spike blood sugar.

Why do so many websites and experts claim that complex carbs are better because they take longer to digest and use more calories? In part, this is because some people confuse complex vs. simple with whole or natural vs. processed. It is true that foods like vegetables tend to have lots of fibers and beneficial nutrients while processed food often lacks these. However, while it is sometimes possible to guess, the effect of a food on one's blood sugar can only be determined by observation.

Fortunately, we have begun to make those observations. A system called the glycemic index rates carbohydrates in comparison with how quickly pure glucose (or white bread as a substitute) raises blood sugar. You can find the glycemic index values online.

An excellent source of information on this is the Harvard Nutrition Source. Read their article on Carbohydrates for a full explanation of this issue.

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10y ago
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12y ago

You receive your complex carbohydrates from foods such as fruit and vegtables. They are complex because your body has to work harder to turn them into usuable energy. This means that they will keep you fuller and you will use the calories you eat to absorb them. You want to stay away from simple sugars which the body easily uses to make energy and stores the remaining about as fat

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12y ago

Carbohydrates break down the sugars and give you energy.

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11y ago

Because complex carbohydrates takes longer for the body to digest and therefore raises the blood sugar more evenly.

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Q: Why should a person eat complex carbohydrates?
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