Modified Fiber Diet
 
The goals of this diet are to minimize frequency of stool and increase stool consistency. Water soluble fiber is typically found in fruits.  Pectin is an example of a water soluble fiber  which is present in various fruits including apples.  Water soluble fibers delay emptying of the stomach and delay movement of food and digestive juices through the intestine.  When these fibers reach the colon, or ileal pouch, they are easily fermented by bacteria.  The bacterial fermentation of fiber leads to the production of short chain fatty acids: butyrate, propionate and acetate.  These fatty acids promote absorption of water and salts by the intestine, thereby decrease increase the consistency of stool, i.e. less watery.  This explains the rationale for the BRAT diet used in babies with diarrhea: Banana, Apple (sauce), Rice, and Toast. 
 
Water insoluble fibers are typically found in vegetables, grains, and legumes.  One example of water insoluble fiber is cellulose (paper).  Foods high in cellulosic fibers, such as bran, have some of the opposite effects on the intestine: they speed up transit and are poorly fermented by bacteria. Thus, these fibers produce bulk in stool which is of help for constipation. Fiber differs according to its plant source.  The role of in-soluble fiber is to produce rapid transit through the intestine and increase bulk. 
 
The following is a list of "fiber foods" to help guide your selections In addition to these foods you should be eating protein foods.  These include: meat, fish, fowl, eggs, and cheese (as tolerated).  If any of these do not agree with you keep a record and try them at a later date.  It may just not be time to foods such as dairy products into your diet. Remember to drink plenty of fluids.  You should consume 6 to 10  8-ounce glasses of water daily.
 
After removal of the large intestine (colon) and or a significant part of the small intestine, especially the ileum, there are food that are better tolerated than others.
 

Foods best tolerated

apples (peeled, cooked/baked

canned apricots

banana

Kananaä banana flakes

grapefruit (pink/ white)(peeled)

oranges (peeled)

canned pears

watermelon

cooked carrots

asparagus tips/cooked

canned whole asparagus spears

green beans

beets (cut and canned)

white potatoes (baked/boiled)

pumpkin

sweet potatoes/ yams

acorn squash

oatmeal (well-cooked/hot)

ginger snaps

sugar cookies

pasta

converted rice

avocado

catsup/ketchup

cream of mushroom soup

creamy peanut butter

agar

guar

mucilages

seaweed

pectin

flaxseeds

locust-bean gum

psyllium

orange/citrus fiber

Foods not recommended immediately after surgery

raw fruits and vegetables

salad

celery

coconut

corn

cucumbers

dried fruit

lettuce

salad greens

mushrooms

nuts

olives

pickles

pineapple

fruits with seeds 

popped corn

seeds (sunflower,etc.)

onions

green peppers (red/yellow/purple/all!!!)

coleslaw

cabbage

radishes

Chinese vegetables(bamboo shoots/water

chestnuts/bean sprouts/etc.)

tomatoes

grapes(all varieties)

brown rice

foods with whole seeds or kernels

whole grain breads