Table S1. Taxonomic Assignments Table. Full taxonomic assignments in SILVA Taxonomy, as classified by Mothur. Taxa are given with bootstrap values for each taxonomic level. Taxa are classified to family, unless there was only one classifiable genus (or lower level) present in the family. Table S2. Serum biochemical parameters at the end of the experiment. Normal diet (ND), high-fat diet (HFD), HFD supplemented with feces of ND-fed mice (HFDS). Table S3. Differential taxa abundances between weeks 0 and 12 and weeks 0 and 28, tested with paired Mann-Whitney U-tests for each experimental group. Taxon = taxon denotation (full taxonomic assignments in SILVA taxonomy are presented in Additional file 1: Table S1); Mann-Whitney U statistic = statistic from paired Mann-Whitney U-tests; pValue = p-value from paired Mann-Whitney U-test; qValue = p-value after FDR correction. Table S4. Results of model comparison for taxa. Taxon = taxon denotation (full taxonomic assignments in SILVA taxonomy are presented in Additional file 1: Table S1); pValue time and pValue diet = p-values for comparisons between null models, models including time and models including time and diet, respectively; qValue time and diet = p-values after FDR correction. Table S5. Differential taxa abundances at 12 and 28 weeks. Taxon = bacteria taxon in SILVA taxonomy, genera (if applicable) are given in parentheses; week = week of experiment; comparison = groups compared; mean 1 group = mean abundance of taxon in first group in comparison field; mean 2 group = mean abundance of taxon in second group; pValue = p-value of Mann-Whitney U-tests; qValue = p-value after FDR correction. Taxa that were differentiated in two groups at both time points are highlighted in bold text. (XLSX 60 kb