The low FODMAP diet was associated with higher faecal pH ( 7.37 ( 7.23 to 7.51 ) vs. 7.16 ( 7.02 to 7.30 ) ; p = 0.001 ) , similar short-chain fatty acid concentrations , greater microbial diversity and reduced total bacterial abundance ( 9.63 ( 9.53 to 9.73 ) vs. 9.83 ( 9.72 to 9.93 ) log10 copies/g ; p < 0.001 ) compared with the Australian diet .