Newswise — As the days grow shorter, your body misses its vitamin D as well as the sun’s warm rays, warns Creighton University researcher Joan Lappe, Ph.D. newswise -随着时间的增长越来越短，你的身体失去了它的维生素d以及太阳的温暖光线，警示c reighton大学研究员琼l appe博士

If you live in North American at latitudes above the 37th parallel – Omaha is near the 41st parallel - you may not be getting enough vitamin D, says Lappe, professor of medicine and holder of the Criss/Beirne Endowed Chair in the Creighton School of Nursing.如果你住在北美，在纬度高于37次平行-奥马哈是近4 1次平行-你可能不会获得足够的维生素d，说l a ppe，医学教授，并担任了纵横交错/b e irne得天独厚主持在c r eighton护理学校。

And that vitamin D is important to your health.和维生素d是重要的，以你的健康。 In fact, a landmark study by Lappe and other Creighton researchers, published in the June 2007 edition of the American Journal of Clinical Nutrition, showed a direct link between vitamin D and cancer prevention.事实上，一个具有里程碑意义的研究lappe和其他creighton研究者，刊登在2007年6月出版的美国临床营养学杂志，显示之间有直接的联系，维生素d和预防癌症。

Humans can get vitamin D from several sources.人类可以得到维生素d ，从几个来源。

During the summer, the body can convert solar energy into ample amounts of vitamin D with just 10-15 minutes of skin exposure daily to the sun.暑假期间，该机构可以转换成太阳能到足够数量的维生素d与公正10-15分钟，皮肤暴露于每日向太阳。 That’s not possible this time of year.这是不可能的，每年这个时候。

“From October until the end of March, the angle of the sun is such that in much of North America no vitamin D is available from that source,” Lappe says. "从10月到3月底，该角的太阳是如此，在许多北美，没有维生素d可从该消息人士透露， " lappe说。 “What that means is most of us are deficient in vitamin D this time of year.” "是什么意思，是我们大多数人缺乏维生素d ，每年的这个时候" 。

While you can get the vitamin from fish oil and a few fortified foods, it’s difficult to take in adequate amounts of vitamin D by eating alone.而你可以得到维生素，从鱼油和几个强化食品，它的困难，采取适当数量的维生素d吃了。 Lappe recommends taking vitamin D3 – the same form of the vitamin that humans make from exposure to the sun. lappe建议采取维生素d3 -同一形式的维生素人类，使接触到阳光。

The amount of vitamin D3 you should take daily is a subject of great debate, Lappe notes.数额维生素d3你应该每天是一门大辩论， lappe纸币。

The U.S. government’s recommended daily allowance is 200 IU until age 50, 400 IU for 50-70 year olds, and 600 IU after age 70.美国政府建议的每日津贴是200国际单位，直到50岁时，有400个国际单位，为50-70岁，和600国际单位后， 70岁。 However, many medical experts believe those recommendations are way too low.然而，许多医学专家认为，这些建议都太低了。

The Canadian Cancer Society recently recommended that people with light skin take 1,000 IU of the vitamin supplement during fall and winter, while people with darker skin or limited sun exposure take that amount throughout the year.加拿大防癌协会最近建议人们与浅色皮肤需1000个国际单位的维生素补充，在秋季和冬季，正当人们深色皮肤或有限暴露在阳光下采取这一数额贯穿全年。

The society’s recommendation coincided with the publication of the Creighton (Cray-ton) research in June 2007.该协会的建议不谋而合的合作，出版了该creighton （克雷吨）的研究在2007年6月。 The four-year study involving 1,179 Nebraska women showed that women taking calcium supplements plus 1,100 IU of vitamin D3 daily experienced a 60 percent decrease in their risk of developing cancer than a placebo group.为期4年的研究，涉及1179内布拉斯加州妇女表明，女性钙补充剂，另加1100个国际单位的维生素d3每日经历了60 ％ ，减少他们的风险，制定癌症比安慰剂组。

“Generally, medical experts consider it safe to take between 1,000 IU and 2,000 IU of vitamin D supplements daily,” Lappe says. "一般来说，医学专家们认为，安全考虑1000国际单位和2000国际单位的维生素d副刊日报" lappe说。