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Carbohydrates

Based on a 2,000 calorie diet, it is recommended that 55 to 60 percent of total daily calories be from carbohydrates. Some of our most common foods contain mostly carbohydrates. Examples are bread, potatoes, legumes, rice, spaghetti, fruits, and vegetables. Many of these foods contain both starch and fiber. The digestible carbohydrates are broken into simpler molecules by enzymes in the saliva, in juice produced by the pancreas, and in the lining of the * small intestine.

Starch is digested in two steps: First, an enzyme in the saliva and pancreatic juice breaks the starch into molecules called maltose; then an enzyme in the lining of the small intestine (maltase) splits the maltose into glucose molecules that can be absorbed into the blood. Glucose is carried through the bloodstream to the liver, where it is stored or used to provide energy for the work of the body.

Table sugar is another carbohydrate that must be digested to be useful. An enzyme in the lining of the small intestine digests table sugar into glucose and fructose, each of which can be absorbed from the intestinal cavity into the blood. Milk contains yet another type of sugar, lactose, which is changed into absorbable molecules by an enzyme called lactase, also found in the intestinal lining.

The digestive system with the esophagus, stomach, liver, gallbladder, pancreas, large intestine, small intestine, appendix, rectum, and anus.

Definitions For This Page - In Alphabetical Order

* Small Intestine
The small intestine is the organ where most digestion occurs. It measures about 22 feet and includes the duodenum, jejunum, and ileum. More about Small Intestine.

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References:
National Digestive Diseases Information Clearinghouse (NDDIC)
April 2008
digestive.niddk.nih.gov

The information discussed above is a general overview and does not include all the facts, or include everything there is to know about any medicine and/or products mentioned. Do not use any medicine and/or products without first talking to your doctor. Possible side effects of medications, other than those listed, may occur. Other brand names or generic forms of this medicine may also be available. If you have questions or concerns, or want more information, your doctor or pharmacist has the complete prescribing information about this medicine and possible drug interactions.