'The wide-spread use of sunscreen in society is undoubtedly a major reason for the explosion of cancer rates in the U.S. First, the vast majority of sunscreens contain toxic ingredients, thus likely to increase cancer risk. Secondly, sunshine, as your will see below, decreases cancer risk. Therefore, if you avoid the sun, you increase your risk of cancer.
The sun creates vitamin D. Adequate amounts of Vitamin D are vital for good health.
The sun controls our circadian rhythm, the internal body clock that makes us tick.
The sun causes release of nitric oxide. See this blog post about the importance of nitric oxide.
In short, the sun has functions we are only beginning to comprehend.'