我们都知道强烈的阳光辐射会导致癌症，殊不知阳光也是抗癌的自然药物。下面我们就来看看它是如何抗癌的。

Although too much exposure to the sun's ultraviolet rays can cause skin cancer, sunshine may have protective effect against some cancers, a U.S. scientist said in April. He said vitamin D, the so -called sunshine vitamin can help to slow down the speed at which cancer cells divide. It is abundant in cod¹ liver oil, fortified² milk and dairying products, and some fatty fish. The study found inverse³ associations between both residential⁴ and occupational exposure to sunlight and mortality from female breast and colon⁵ cancers.

Scientists found the more deaths from skin cancer in sunnier states but the number of people who died from the other cancers was lower in sunshine area. Working outdoors in a sunny climate was also associated with fewer breast and colon cancer deaths but not with the other cancers.