Fiber: An Introduction

The question, what is fiber?, is answered at this link of MedicineNet.com. Inclusion of fiber in one's diet is essential to avoid constipation. Fiber is found in plants which we ingest in the form of fruits, grains and vegetables. It is the undigestible part which includes carbohydrates for which our bodies lack enzymes able to break them down.

Fiber can be soluble or insoluble. Soluble fiber dissolves in water and includes beans as well as fruits like apples, bananas and berries. Insoluble fiber allows for increased movement through the digestive tract. Sources include whole wheat, bran, nuts and some fruit and vegetable skins.