24 Jun 2021 --- A diet rich in sugar and fat leads to an imbalance in the gut’s microbial culture and may contribute to inflammatory skin diseases such as psoriasis and joint inflammation, according to a study from the University of California Davis (UC Davis). “There is a clear link between skin inflammation and changes in the gut microbiome due to food intake,” Sam Hwang, professor and chair of dermatology at UC Davis Health and senior author on the study, tells NutritionInsight.