A total of 65 patients with dumping syndrome after gastric resection were under study. It has been found that addition of 10 and 20 g of wheat bran to semolina porridge significantly (p less than 0.05) inhibits the rate of gastric stump and small intestine evacuation, and in 1/3 of the patients it promotes lowered manifestation and duration of dumping syndrome. It has been suggested that the inhibitory action of wheat bran is caused by bran viscosity and, probably, mediated by intestinal hormones released from endocrine cells of the small intestine mucosa. The results of the investigations conducted can be used in the validation of the diet therapy of patients with dumping syndrome.