Genistein, a compound found in soy that functions as a phytoestrogen, has been found to play a role in the body’s inflammatory response. By suppressing the expression of inflammatory genes and inhibiting tumor cell growth, genistein is thought to have both anti-inflammatory and cancer fighting properties. This study seeks to demonstrate genistein’s potential to mitigate the negative consequences of consuming a high fat diet specifically as it relates to increased inflammation and changes in the gut microbiome. Using an animal model, the study tested whether supplementing the mice’s diet with soy derived genistein would affect their serum IL-6 levels and the way in which their gut microbiomes responded to their high fat consumption. It was presumed that genistein supplementation would result in a less significant shift from the biomarkers tested in the control group and reduce the impact of the high fat diet. It was also hypothesized that consumption of the high fat diet would raise IL-6 levels and increase the presence of harmful bacteria in the test subjects.