TNF and fatty liver disease: Even with only a small number of mice per treatment, we observed significant effects of ongoing exposure to low dose UVR in reducing signs of NAFLD in the mature mice fed a high fat diet, including reduced hepatic steatosis and fibrosis, and non-significant reductions in inflammatory foci and levels of tnf (pro-inflammatory cytokine) and tgfß1 (pro-fibrotic cytokine) mRNAs, which both promote the development of NASH [18].