Fu
brick tea (FBT) is a microbial-fermented tea, which is produced
by the solid-state fermentation of tea leaves. Previous studies have
proved that FBT aqueous extracts could attenuate obesity and gut microbiota
dysbiosis. However, the bioactive components in FBT that contribute
to these activities remain unclear. In this study, we aimed to investigate
the effects of FBT polyphenols (FBTPs) on obesity, gut microbiota,
and gut microbiota-related intestinal oxidative stress and barrier
function and to further investigate whether the antiobesity effect
of FBTPs was dependent on the alteration of gut microbiota. The results
showed that FBTP supplementation effectively attenuated obesity in
high-fat diet (HFD)-fed rats. FBTP supplementation improved the intestinal
oxidative stress and intestinal barrier function, including intestinal
inflammation and the integrity of the intestinal barrier. Furthermore,
FBTP intervention significantly attenuated HFD-induced gut microbiota
dysbiosis, characterized by increased phylogenetic diversity and decreased
Firmicutes/Bacteroidetes ratio. Certain core microbes, including Akkermansia muciniphila, Alloprevotella, Bacteroides, and Faecalibaculum, were also found to be improved by
FBTPs. Moreover, the antiobesity effect of FBTPs was gut microbiota-dependent,
as demonstrated by a fecal microbiota transplantation experiment.
Collectively, we concluded that FBTPs reduced obesity by modulating
the gut microbiota and gut microbiota-related intestinal oxidative
stress and barrier function. Therefore, FBTPs may be used as prebiotic
agents to treat obesity and gut microbiota dysbiosis in obese individuals.