Many holidaymakers dare only with sun hats, T-shirts and oiled thick to the beach. Children are not allowed to leave the shade of the parasols while playing: for fear of the risks, many people only go into the sun with bad feelings. But it depends on the dose. And those who avoid the sun also miss their numerous positive effects.
Sun for natural well-being
Thomas Luger, director of the Department of Dermatology in Münster, examined the skin before and after sunbathing. He found that the sun-exposed skin areas contained small amounts of a hormone that causes the release of endogenous beta-endorphins. These are substances that are chemically related to the opiates. The sun ensures natural well-being.
Production of vitamin D
UV rays convert cholesterol directly into vitamin D in the skin. More than 90 percent of the vitamin D required by the body is formed in the skin. Only a small amount comes from the diet, such as fatty fish. How much vitamin D is produced depends on the skin type. The darker the skin, the more sunlight is needed to get the same amount of vitamin.
Michael F. Holick and his research team from Boston University showed that vitamin D also has a strong influence on the prevention of certain cancers. Part of the vitamin D is converted into hormones that prevent abnormal cell growth and strengthen the body's resistance. Sunlight also affects blood pressure. High pressure patients were irradiated with artificial sunlight for eight weeks. A comparison group received vitamin D in tablet form. Although they reached a similar level of vitamin D, the blood pressure-lowering effect was lost. Only the sunlight had the positive effect.
How much sun is so good and from what dose does it harm?
Professor Michael F. Holick recommends a simple rule: "Most people know from experience how long their skin type lasts until a sunburn sets in. For a quarter of that time, set your skin every day when the sun is shining If you want to stay longer in the sun, use the usual sunscreen. " With this method, the US expert, man saves enough vitamin D to get well over the next winter.