Resistant Starch Wheat for Improved Metabolic Health

Resistant starch (RS) is a type of dietary fiber that provides fermentable carbohydrate (FC) in the lower bowel yielding positive effects on postprandial glycemia and weight management as well as digestive tract health. RS is defined as the portion of starch resistant to digestion by amylases, allowing it to reach the distal intestine where it can be fermented by the resident intestinal microbiota. A limited number of human studies using RS from high amylose corn have demonstrated that RS increases synthesis of gut peptides that improve glucose homeostasis and insulin secretion. Based on these studies, the FDA has recently approved the following health claims for resistant starch derived from corn (RS2): lowering of blood glucose, blood cholesterol, and blood pressure; increased mineral absorption; improved laxation; and reduced energy intake. The purpose in the proposed "proof of concept" study here is to show that RS provided in the form of wheat flour products has similar beneficial effects. The investigators aim to further explore the effect of RS on the gut microbiota. The intestinal microbiome is comprised of over one trillion bacterial cells comprised of approximately one thousand species that perform diverse functions ranging from energy harvest, angiogenesis, immunomodulation, and regulation of mood and behavior. Some of the major products of bacterial metabolism include acetate, propionate, and butyrate, the major short chain fatty acids (SCFA). These bioactive fermentation products have been associated with improved glucose homeostasis, attributed, in part, by their interactions with receptors on intestinal cells to augment secretion of glucagon-like peptide-1 (GLP-1), an incretin hormone known to stimulate insulin secretion.

This study is a randomized, cross-over design consisting of two 1-week dietary intervention periods as well as a 2-week washout period in between. Subjects will be randomly assigned to receive either RS wheat first or regular wheat first, then will be crossed over to the opposite treatment following a 2-week washout period. Wheat products made from RS wheat and regular wheat will be provided and the volunteers will be instructed to incorporate the products into their usual diet for 7 days. This study will probe the associations between the gut microbiota profiles, fermentation of RS wheat, microbial-mediated alterations in bile acids, and glycemia. The investigators will measure these effects in healthy, middle-aged humans using an interdisciplinary approach that integrates nutrition, microbiology, intestinal physiology, and analytical chemistry.