Table 1.

The relationship between daily lifestyle factors and the risk of skin cancers.

	Melanoma	Squamous Cell Carcinoma	Basal Cell Carcinoma	Merkel Cell Carcinoma
Circadian rhythm disruption	Risk up [54]	No association [54]	Risk down [54]
Smoking	Risk down [80,81,82]	Risk up [85,86,87] No association [88,89].	Risk down [90,91,92,93] No association [85,86,94,95,96,97,98].
Alcohol	Risk up [109]	Risk up [114]	Risk up [114]
Dietary fiber/vegetables/fruits	Vitamin A: Risk down [108,116,117] Furocoumarins: No association [118]	Citrus: Risk down [120] No association [118,121,122]	Furocoumarins: Risk up [118,120,121]
Obesity	Risk up [124,128,129] No association [125,126,127]	Risk up [126] Risk down [127]	Risk down [126,127]
Fatty acids	omega-3 fatty acid: Risk down [138] omega-6 fatty acid: Risk up [137]	Omega-3 fatty acid: No association [138] Omega-6 fatty acid: Risk up [149]	Omega-3 fatty acid: No association [138] Omega-6 fatty acid: Risk up [137]
Coffee/caffeine	Risk down [154,155,156]		Risk down [160,161,162]
Ultraviolet light	Risk up [165,166]	Risk up [45,170]	Risk up [45,46]	Risk up [165,176]