Skip navigation | ||
|
||
Medical Encyclopedia |
|
Other encyclopedia topics: | A-Ag Ah-Ap Aq-Az B-Bk Bl-Bz C-Cg Ch-Co Cp-Cz D-Di Dj-Dz E-Ep Eq-Ez F G H-Hf Hg-Hz I-In Io-Iz J K L-Ln Lo-Lz M-Mf Mg-Mz N O P-Pl Pm-Pz Q R S-Sh Si-Sp Sq-Sz T-Tn To-Tz U V W X Y Z 0-9 |
Contents of this page: | |
|
Alternative names Return to top
Diet - fiber; Roughage; BulkDefinition Return to top
Dietary fiber is found in plant foods. Fiber cannot be digested by humans. It has no calories because the body cannot absorb it.Function Return to top
Dietary fiber provides a feeling of fullness and adds bulk in the diet. This assists digestion and elimination.Food Sources Return to top
There are two forms of fiber: soluble and insoluble. Soluble fiber attracts water and turns to gel during digestion. This slows digestion and the rate of nutrient absorption from the stomach and intestine. It is found in oat bran, barley, nuts, seeds, beans, lentils, peas, and some fruits and vegetables. Insoluble fiber is found in foods such as wheat bran, vegetables and whole grains. It appears to speed the passage of foods through the stomach and intestines and adds bulk to the stool.Side Effects Return to top
Eating a large amount of fiber in a short period of time can cause intestinal gas (flatulence), bloating, and abdominal cramps. This subsides once the natural bacteria in the digestive system get used to the increase in fiber in the diet. The problem with gas or diarrhea can be reduced considerably by adding fiber gradually to the diet.Recommendations Return to top
The average American now eats 10 to 15 grams of fiber per day. The recommendation for older children, adolescents and adults is 20 to 35 grams per day. Younger children will not be able to eat enough calories to achieve this, but introducing whole grains, fresh fruits and other high fiber foods is suggested.
To ensure adequate fiber intake, eat a variety of foods, including more fruits, vegetables, whole grains, cereals, and dried beans and peas. Add fiber gradually over a period of a few weeks to avoid abdominal discomfort. Water aids the passage of fiber through the digestive system. Drink plenty of fluids (approximately 8 glasses of water or noncaloric fluid a day).
Peeling can reduce the amount of fiber in a food. Cooking may actually increase your intake by decreasing the volume of the food that is prepared. Therefore, eating fiber-containing food is beneficial either cooked or raw.
Home | Health Topics | Drug Information | Encyclopedia | Dictionary | News | Directories | Other Resources | |
Copyright | Privacy | Accessibility | Selection Guidelines U.S. National Library of Medicine, 8600 Rockville Pike, Bethesda, MD 20894 National Institutes of Health | Department of Health & Human Services |
Page last updated: 28 October 2004 |