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Twenty years ago the very idea of an international conference on the fiber contained in plant food would have been totally inconceivable. At that time fiber was generally viewed as an inert component of food of no nutritional value and consequently consid ered as a contaminant, the removal of which would enhance the purity of a product. It was measured by a now obsolete and almost worthless test introduced in the last century for veterinary rather than human nutrition, and what was measured was referred to as "crude fiber," containing part of the cellulose and lignin but none of the numerous components of fiber now known to play important roles in the maintenance of health. There were a few lone voices prior to the last two decades who had extolled the laxative properties of the undigested portion of food, assuming that these were related to its irritant action on the bowel mucosa. In retrospect this was a total misconception, and "softage" would have been a more appropriate term than "roughage," since its presence insured soft, not irritating, colon content.
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This volume carries the proceedings of the Vahouny Fiber Symposium, which took place in Washington DC, in March of 1996. George V. Vahouny pioneered this conference, which was conceived as a means of exchanging information on the latest advances in fiber research. The conference was renamed in George Vahouny's honor after his untimely death. In this volume we have included the reminiscences of Prof. A.R.P. Walker, one of the pioneers in the field, and discussion of the epidemiological findings relating dietary fiber to heart disease, cancer, and gastrointestinal disease. As the overall definition of fiber has broadened we have included for discussion other aspects of carbohydrate chem istry and metabolism. Complex carbohydrates were the subject of a full session and resis tant starch and the role(s) of oligosaccharides were discussed later in the meeting. Another area of fiber metabolism that is beginning to burgeon is that of the short chain fatty acids, and this too was the subject of presentations and discussion. In addition, the more familiar topics in dietary fiber were updated. Workshops devoted to specific areas of fiber research have now become a mainstay of these meetings, and they were repeated successfully. Due to restraints on spending, the attendance at this meeting was somewhat smaller than usual but the discussion was lively and pertinent. We are deeply grateful to our sponsors and contributors for their continuing interest in dietary fiber research, and for their generous support of this symposium.