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High-fibre diets are beneficial for many health outcomes  via  a wide range of mechanisms including gut microbiota fermentation-derived short-chain fatty acid (SCFAs) production. Mycoprotein (marketed as Quorn) is a food high in fibre (&gt;6 g/100 g wet weight (ww)) and protein (13 g/100 g ww) which has been shown to have positive effects on glycemic control and appetite in humans. Nevertheless, the mechanisms underpinning this are poorly understood. Here, we investigate the changes in gut microbiota α- and β-diversity, pH and SCFAs production in faecal batch cultures supplemented with pre-digested mycoprotein (Quorn), soy, chicken and control (unsupplemented) using eight fresh stools from healthy donors. The results showed that pre-digested mycoprotein did not alter pH ( p  = .896), α- or β-diversity of the gut microbiota when compared to the control, soy, and chicken. Nevertheless, chicken led to a significant increase in total SCFAs post-24 h vs. control (+57.07 mmol/L,  p =  .01). In particular, propionate increased when compared to soy (+19.59 mmol/L,  p =  .03) and the control (+23.19 mmol/L,  p  &lt; .01). No other differences in SCFAs were detected. In conclusion, pre-digested mycoprotein was not fermented  in vitro  by healthy gut microbiota in the settings of this experiment.

Gut microbiota fermentation profiles of pre-digested mycoprotein (Quorn) using faecal batch cultures in vitro : a preliminary study