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All Boards >> Irritable Bowel Syndrome Research Library

HeatherAdministrator

Reged: 12/09/02
Posts: 7677
Loc: Seattle, WA
Psyllium increases gas production and promotes gas retention
11/28/04 02:43 PM

Gut 2004;53:1577-1582
2004 by BMJ Publishing Group Ltd & British Society of Gastroenterology

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GUT MOTILITY

Inhibitory actions of a high psyllium diet on intestinal gas transit in healthy volunteers

S Gonlachanvit, R Coleski, C Owyang and WL Hasler
Division of Gastroenterology, Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, MI, USA


ABSTRACT
Background: Psyllium fibre treatment often produces gaseous symptoms which have been attributed to fermentation by colonic bacteria with increased gas production. Effects of psyllium fibre ingestion on intestinal gas flow are unexplored.

Aims: We aimed to test the hypothesis that consumption of a high psyllium fibre diet retards gas transit.

Subjects: Ten healthy volunteers participated.

Methods: To investigate the effects of psyllium fibre on gas dynamics, physiological gas mixtures were jejunally perfused at 12 ml/minx2 hours after a standard diet for seven days with and without psyllium 30 g/day in a crossover fashion. Gas was collected from an intrarectal catheter to bypass the anus and evacuation was quantified in real time using a barostat.

Results: On initiating gas perfusion under control conditions, an initial lag phase with no gas expulsion was observed (1129 (274) seconds). Thereafter, gas evacuation from the rectum proceeded with cumulative volumes of 1429 (108) ml by the end of the second hour. Evacuation was pulsatile with passage of 20.9 (2.5) boluses, with mean volumes of 68.2 (5.0) ml. Psyllium fibre prolonged the lag time (2265 (304) seconds; p<0.05) and reduced cumulative gas evacuation volumes (1022 (80) ml; p<0.05). Decreased gas evacuation resulted from reductions in the numbers of bolus passages (14.2 (1.1); p<0.05) but not bolus volumes (70.7 (3.4) ml; p = 0.66).

Conclusions: Consumption of a high psyllium fibre diet retards intestinal gas transit by decreasing bolus propulsion to the rectum. Thus, in addition to increasing gas production by colonic flora, psyllium fibre ingestion may elicit gaseous symptoms by promoting gas retention.

http://gut.bmjjournals.com/cgi/content/abstract/53/11/1577

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Heather is the Administrator of the IBS Message Boards. Shes the author of Eating for IBS and The First Year: IBS, and the CEO of Heather's Tummy Care. Join her IBS Newsletter. Meet Heather on Facebook!

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