Supplementation with resistant starch leads to weight loss and improved insulin sensitivity by altering the gut microbiome and increasing secondary bile acids, according to a recent study in Nature Metabolism.
By Dr. Chinta SidharthanFeb 27 2024Reviewed by Susha Cheriyedath, M.Sc. In a recent study published in the journal Nature Metabolism, a team of scientists investigated whether modulation of the gut microbiome using dietary fiber supplementation in the form of resistant starch could help with insulin resistance and weight loss and offer a potential treatment avenue for metabolic disorders.
Increasing evidence indicates that the gut microbiome plays a pivotal role in the regulation of human physiology and development of various diseases. Gut microbiome composition and diversity are intricately linked to the metabolism of glucose and fat and inflammation. Furthermore, they studied antibiotic-treated mice that had received gut microbiomes from human donors that had already been modified through resistant starch supplementation to understand how gut microbiomes modified through supplementation with resistant starch influence glucose metabolism and adiposity. The metabolomic advantages offered by the gut microbiome modified through resistant starch supplements were also explored.
The starch was provided in sachets in powdered form, and all the participants in the treatment and control groups consumed one packet of the appropriate starch twice a day before a balanced, isoenergetic meal that was provided thrice a day. Since this was a crossover clinical trial, all the participants underwent two eight-week-long interventions, one for the resistant starch treatment and the other for the control treatment.
The gut microbiota impacts the host physiology through signaling metabolites, of which bile acids play a significant role. Secondary bile acids, such as glycodesoxycholic acid, deoxycholic acid, glycocholic acid, and taurodeoxycholic acid, are important in improving insulin sensitivity and ameliorating hepatic steatosis. The enzyme bile salt hydrolase carries out the deconjugation of secondary bile acids.
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