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Intestinal hormones stimulate more than 50% of the insulin response after oral glucose administration. Short chain fatty acids stimulate mucosal adaptation and may alter proglucagon messenger RNA and release of the insulin secretagogue, glucagon-like peptide-1 (GLP-1). Sprague-Dawley rats ingested a fiber-free elemetnal diet or an elemental diet supplemented with 30% fiber providing similar energy and nutrients for 14 days. The cecal and colonic short chain fatty acids contents were significantly higher in the 30% fiber group. Ileal proglucagon messenger RNA levels were significantly higher in the 30% group vs. the 0% group (11.47 +/- 0.87 vs. 6.52 +/- 0.87 densitometer units), respectively. Similar trends were seen in the colon (13.36 +/- 1.0 vs. 10.90 +/- 0.77 densitometer units; P = 0.07). Plasma GLP-1, insulin, and C peptide levels 30 min postoral glucose were significantly higher in the 30% fiber group vs. the 0% group (19.8 +/- 1.2 vs. 15.4 +/- 1.2 pg/ml, 2.67 +/- 0.4 vs. 1.29 +/- 0.5 ng/ml, and 964.4 +/- 94.4 vs. 530.2 +/- 120.4 pM, respectively). Plasma glucose and glucagon did not differ between groups. A diet supplemented with fiber is able to significantly alter proglucagon gene expression and modulate GLP-1 and insulin secretion. These novel findings deepen our understanding of the beneficial role of fiber in improving glucose homeostasis.

Dietary fiber modulates intestinal proglucagon messenger ribonucleic acid and postprandial secretion of glucagon-like peptide-1 and insulin in rats.