http://www.pnas.org/cgi/content/full/98/13/7510 "Epidemiological and animal-based investigations have indicated that the development of skin cancer is in part associated with poor dietary practices. Lipid content and subsequently the derived fatty acid composition of the diet are believed to play a major role in the development of tumorigenesis." "the development of skin cancer has also been reported to be related to dietary factors, including dietary lipids. Epidemiological and experimental studies have shown that different classes of dietary fatty acids have a variety of effects on tumor development."