Drinking more coffee is associated with a lower risk of both BCC[1] and melanoma, with these findings specific to caffeinated coffee.[2]
A few prospective cohort studies have found that eating more citrus fruit (e.g., grapefruit, oranges) is associated with a higher risk of melanoma.[3] This could be due to citrus containing psoralens, compounds that become carcinogenic when exposed to ultraviolet light.[4]
Higher alcohol consumption is associated with a higher risk of BCC,[5] SCC,[5] and melanoma.[6]
A higher intake of retinol (a form of vitamin A) is associated with a lower risk of melanoma,[7] although high-quality research on the topic is somewhat limited.