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Chapter: Nutrition and Diet Therapy: Diet and Gastrointestinal Problems

Residue-Controlled Diets

Fiber is that part of food that is not broken down by digestive enzymes.

RESIDUE-CONTROLLED DIETS

 

Fiber is that part of food that is not broken down by digestive enzymes. It is called dietary fiber. Most dietary fiber is found in plant foods. Some is soluble, and some is insoluble. Examples of dietary fiber in plants include the outer shells of corn kernels, strings of celery, seeds of strawberries, and the connective tissue of citrus fruits.

 

Residue is the solid part of feces. Residue is made up of all the undigested and unabsorbed parts of food (including fiber), connective tissue in animal foods, dead cells, and intestinal bacteria and their products. Most of this residue is composed of fiber.

 

Diets can be adjusted to increase or decrease fiber and residue. The specific names of these diets vary among health care facilities. The specific foods allowed and thus the amount of fiber and residue allowed will depend on the physician’s experience and the client’s condition.

 

The High-Fiber Diet

 

High-fiber diets containing 30 grams or more of dietary fiber are believed to help prevent diverticulosis, constipation, hemorrhoids, and colon cancer. They also are helpful in the treatment of diabetes mellitus  and atherosclerosis.

 

It is currently estimated that the normal diet in the United States contains about 11 grams of dietary fiber each day. A high-fiber diet is often 25 to 35 grams and should not exceed 50 grams a day. The recommended foods for this diet include coarse- and whole-grain breads and cereals, bran, all fruits, vegetables (especially raw), and legumes. Milk, meats, and fats do not contain fiber (Table 20-4). The diet is nutritionally adequate. High-fiber diets must be introduced gradually to prevent the formation of gas and the discomfort that accompanies it. Eight 8-ounce glasses of water also must be consumed along with the increased fiber. 


The Low-Residue Diet

 

The low-residue diet of 5 to 10 grams of dietary fiber a day is intended to reduce the normal work of the intestines by restricting the amount of dietary fiber and reducing food residue. Low-fiber or residue-restricted diets may be used in cases of severe diarrhea, diverticulitis, ulcerative colitis, and intestinal blockage and in preparation for and immediately after intestinal surgery.

 

In some facilities, these diets consist of foods that provide no more than 3 grams of fiber a day and that do not increase fecal residue (Tables 20-5 and 20-6). Some foods that do not actually leave residue in the colon are considered “low-residue” foods because they increase stool volume or provide a laxative effect. Milk and prune juice are examples. Milk increases stool volume, and prune juice acts as a laxative.




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