Fig. 6

Microbial taxonomic and functional alpha diversities are associated with habitual diet. a Significant (FDR < 0.05) Spearman correlations found between the fungal taxonomic alpha diversity and diet categories. The x-axis is the value of the correlation coefficient, the y-axis is the name of the diet categories. b Significant (FDR < 0.05) Spearman correlations found between the fungal functional alpha diversity and diet categories. The x-axis is the value of the correlation coefficient, the y-axis is the name of the diet categories. c Significant (FDR < 0.05) Spearman correlations were found between the bacterial functional alpha diversity and diet categories. The x-axis is the value of the correlation coefficient, the y-axis is the name of the diet categories. d Network of the fungal functional alpha diversity, bacterial functional alpha diversity, and diet categories detected to be significantly (FDR < 0.01) correlated with them. The r values are labeled for the overlapped diet categories. The edges are the Spearman correlation coefficients between the two nodes linked. The color of the edges represents the symbol of the correlation. The size of the nodes represents the node degree values