Very complex carbs (dietary fiber) also have a very complicated molecular structure, and also are resistant to most digestive enzymes produced by the human body. As a result, they cannot be broken down into glucose or other nutrients at all. This is why fiber transits the intestinal tract largely undigested. This has a knock-on effect on the speed of digestion of other carbs around them. For example, where certain starches are “protected” by indigestible fibrous wrapping, the enzymes cannot get to grips with the starch as fast as normal. Also, the presence of soluble fiber in the stomach and intestine typically creates a viscous mass of digesting-food in which carbs and enzymes take longer to mix. Result? Carb digestion slows down.
As we have seen, because the human body runs on glucose all carbs are converted into glucose in the digestive tract. The glucose then enters the bloodstream and thus contributes to a rise in “blood-glucose”.
Blood Glucose Must be Kept Within Limits
A very high level of glucose in the blood is toxic, while a very low level is detrimental to bodily functions. Therefore the body has a system to regulate the...