The study procedures will consist of:
* taking a dietary supplement containing either fiber or starch (starch serves as a control for fiber) for six weeks. The fiber dose initially employed will be 30 g/day of high amylose corn and the control starch dose employed will be 30 g/day of waxy corn starch. Supplements which come in dry powder form will be mixed in liquid or food for consumption.
* filling out a food record and a quality of life questionnaire
* keeping a diary of any gi symptoms
* collecting samples of blood, spent dialysate, urine(if the patient still makes urine) and stool.
