Probiotic-fermented Chinese dwarf cherry [Cerasus humilis (Bge.) Sok.] juice modulates the intestinal mucosal barrier and increases the abundance of Akkermansia in the gut in association with polyphenols

•Chinese dwarf cherry fermentation juice increases abundance of Akkermansia in gut.•Polyphenol displayed a significant positive correlation with sIgA and butyric acid in colon.•Fruits fermentation juice does regulate intestinal musical barrier to influence host immunity.