A fiber supplement of resistant starch achieved weight loss and insulin sensitivity in people with overweight or obesity, partially by changes in gut microbiota.
In animal studies, resistant starch , a kind of dietary fiber, has shown a potential to reduce body fat along with other metabolic benefits, but human dietary studies of RS have been inconsistent, especially with a high-fat diet.
Researchers conducted a crossover, randomized trial to study the effect of RS as a dietary supplement on 37 individuals with overweight orParticipants were fed a similar background diet and either 40 g of RS or an energy-matched placebo starch daily for 8 weeks and then switched between the two in a separate 8-week period.
The primary outcome was body weight, and the secondary outcomes were visceral and subcutaneous fat mass, waist circumference, lipid profiles, insulin sensitivity, metabolome, and gut microbiome. RS's impact on gut microbiota composition and function was assessed with metagenomics and metabolomics, and RS-modified gut microbiota's effect on host body fat and glucose was confirmed by transferring from select average participants to mice.< .001), but there was no significant change in body weight in those on placebo starch.=.025) and showed a greater reduction in fat mass, waist circumference, and other obesity-related outcomes.
The levels of pro-inflammatory cytokines, such as serum tumor necrosis factor-alpha and interleukin-1 beta, were significantly lower in participants who consumed RS than in those who had placebo starch."Our study provided an effective dietary recommendation using RS as a supplement , which may help to achieve significant weight loss," the authors commented.
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