CARBOHYDRATES are sugars. There are three types of carbohydrates.

SIMPLE carbohydrates (glucose, sucrose, lactose and fructose)
contain two or less units of sugar. Examples of simple sugars 
are the processed sugar and the fruit sugar. Simple carbohydrates 
are being usually rapidly absorbed and utilized by the body. 
Glucose is the primary energy source for the brain and nerves.

COMPLEX carbohydrates (starch, cellulose, hemicellulose and glycogen)
are made up of two or more simple sugars linked together. 
Examples of complex sugars are breads, cereals, grains, pasta, 
rice, potatoes, vegetables and fruits. Complex carbohydrates 
are being digested into simple sugars.Foods high in complex carbohydrates 
are usually low in calories and have a wide variety of vitamins and 
minerals.

Carbohydrates are a good source of energy but excess carbohydrates 
are stored as fat.

FIBER is  complex carbohydrates which can not be broken down
by the human digestive system. It promotes a feeling of fullness 
providing a little energy.

Insoluble: whole wheat breads and cereals, wheat bran, cabbage, 
beets, carrots, Brussels sprouts, turnips, cauliflower and 
apple skin (pectin).It is an important aid in normal bowel
function. 
Soluble: oat bran, oats, legumes, citrus fruits, strawberries, 
apple pulp, psyllium, rice bran, and barley. It has been shown 
to reduce the risk of cancer and lower the blood cholesterol.

Total dietary fiber intake should be 25-30 grams a day from food, 
not supplements.