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Beimeicuige: The US is to dominate the world, the show about vitamin D, also known as VD. We do very little can be obtained from the daily diet to, because the main source of VD through the sunlight, synthesized by the subcutaneous tissue itself. Mom often ask me how long it needs to sun drying it? The answer is: the exposed areas of skin, such as the corresponding arm, face and other parts of the summer sun a few minutes home store is sufficient, but in winter you need 2-3 hours a day, a week before they can maintain normal levels of VD. Because many factors associated with the sun, but also the length of time and weather, major, home store difficult to precisely say specifically a few hours in the sun can ingest enough VD. United States, Canada, Britain and others have recommended home store that infants of oral vitamin D, even suggested that the United States has been to add to adolescence. But countries, different climates around the country, whether to add the baby VD have different views, such as Singapore, due to abundant sunshine, hardly missing Singaporeans VD, including exclusive breastfeeding of infants have sufficient through occasional sun VD. So we Chinese do? First, in many parts of China are not so good as Singapore sunshine. But even in Singapore, there are still some people will pay particular attention to the lack of sun VD, such as for religious reasons Baotou women. In high latitudes, such as North America, Canada, northern China, there are other less sunshine city (such as most of the time the rainy Shanghai), daily life is not fully in the sun, modern way of life and past a big difference, fewer outdoor activities, transportation out there, even walking, have a chance to bask in the sun of the weather, a lot of women will wear a hat or an umbrella. Shanghai women who do not have a bag a few umbrellas? We have an umbrella frame bike. The sun is not enough, but the food is difficult to obtain sufficient VD, then rely on supplements make up a little, beneficial and harmless. Can not get enough food VD, and no crowds home store enough outdoor activities, such as part of exclusively breastfed infants, the mobility of the elderly always stay indoors, the skin is black people (take longer to produce the same amount of sunshine The VD), who have osteoporosis, some pregnant home store women breast-feeding, oral supplementation is recommended amount of VD
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