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##Factors Driving the Differences in Microbial Community Composition and Diversity of Individual Meals  There was no effect of diet type on the overall community composition within individual meals (PERMANOVA with compare_categories.py, P=0.591). In fact (PERSONALLY, I HATE THE USE OF "IN FACT"), there There  was no significant clustering based on any potentially distinguishing feature tested, including whether the meals contained fermented foods, dairy, whether they ware raw or cooked, or the calculated nutritional content (see Table 3 for complete meal metadata.) Nevertheless, a large amount of variation (53%) is explained by PC1 (EXPLAIN THIS), and our attempts to determine the factors driving this variation led us to look at specific taxonomic groups that may be important. We did this in two ways. First, we sorted the stacked bar charts by the PC1 loadings (EXPLAIN THIS). (See figure below) This made it apparent that the cluster of 4 meals on the right side of PC1 was comprised of samples that were dominated by Lactic Acid Bacteria (WHAT ARE THESE?), that the Vegan Snack #1 was unique in that it is dominated by Xanthamonadaceae (70.4%) (WHAT ARE THESE?), and that the cluster of 7 on the left side of PC1 was a group of meals with a large percentage (average = 27%) of Thermus (WHAT ARE THESE). Second, we looked for correlations between the relative abundance of a single taxon and the PC1 loading for each meal using a simple regression. The bacterial family most tightly correlated with PC1 is Streptococcaceae (r = 0.852).   We also asked whether the relative abundance of a particular taxonomic group was significantly correlated to the nutritional content of the meals, via Pearson's correlations. For this, we only looked at organisms that were present in all 15 meals. Due to the exploratory nature of this study, there were no specific hypotheses tested with these correlations, but some taxa frequently abundant in human microbiome studies were found to be significantly correlated with a nutrient (Table 6). For example, members of the genus Blautia are frequently observed in human fecal samples, and in our study, it was found to be less abundant in meals with a lower sugar content (Fig. X). The implications of this finding are unclear, but it does suggest that there could be an interesting relationship between the nutritional content of the foods that we eat and our gut microbiome, not just because we are "feeding" our gut microbes, but because we are eating them as well.