Pectin is known to delay gastric emptying and alleviate dumping symptoms when ingested with hyperosmolar, glucose-containing meals. As the treatment of dumping syndrome includes frequent, small dry meals, the effect of pectin ingested in muffins was tested in five patients with severe, intractable dumping syndrome after gastric resection. Ingestion of ^99mTc-DTPA-labelled muffins containing 5 g pectin did not alleviate dumping symptoms or delay gastric emptying compared with muffins without pectin. Pectin does not seem to be beneficial as a supplement in the conventional dietary management of post-gastrectomy dumping.