A few notes from Mercola's Vital Votes comments:
The main cause of skin cancer is the wrong types of fats being consumed, including margarine & vegetable oil. Traditional diets didn't contain them. Cholesterol produced from these oils in the skin, when it is exposed to the sun, can produce tumours. The human body can't metabolise these bad fats. They are also responsible for the esculating macular degeneration, alzhiemer's & child behavoural problems etc. If you stick to butter & coconut oil for cooking & unheated virgin olive oil on salads together with a healthy diet, skin cancer shouldn't be of concern. We're lucky in N.Z. & Aust. that our cows are grass fed, producing healthy fats, unlike grain fed cattle. Check Dr. M's search engine for healthy fats & the Weston A Price site.
Exposure to sunlight may reduce your risk of advanced breast cancer, according to new research from Stanford University.
The study followed 4,000 women between the ages of 35 and 79, and evaluated the effects of long-term sun exposure. Women with a light skin color who had high sun exposure had half the risk of developing advanced breast cancer (cancer that has spread beyond the breast) as women with low sun exposure.
High sun exposure was defined as having dark skin on your forehead, since your forehead is typically exposed to the sun often.
Sun exposure may work to prevent cancer because it increases the levels of vitamin D in your body. While you can get some vitamin D from your diet, up to 90 percent comes from your exposure to sunlight.