Among Vitamins, D Seems Short for 'Does a Lot'

Among Vitamins, D Seems Short for 'Does a Lot'
Studies are finding that the vitamin known for building strong bones may also help prevent many diseases. Transcript of radio broadcast:
15 July 2008

This is the VOA Special English Health Report.

Vitamin D helps bones and muscles grow strong and healthy. Low levels of vitamin D can lead to problems such as rickets, a deformity mainly found in children. Osteoporosis, the thinning of bone, is a common problem as people, especially women, get older.

But more and more research is suggesting that vitamin D might also help prevent many diseases.
The easiest way to get vitamin D is from sunlight. The sun's ultraviolet rays react with skin cells to produce vitamin D. But many people worry about getting skin cancer and skin damage from the sun. As a result they cover their skin or wear sunblock or stay out of the sun.

Also, darker skinned people produce less vitamin D than lighter skinned people. Production also decreases in older people and those living in northern areas that get less sunlight.

Not many foods naturally contain vitamin D. Foods high in this vitamin include oily fish such as salmon, tuna and mackerel, and fish liver oils.

Boston University researchers reported last year that farmed salmon had only about one-fourth as much vitamin D as wild salmon.

Small amounts of D are found in beef liver, cheese and egg yolks. And some people take dietary supplements containing the vitamin. But most of the vitamin D in the American diet comes from foods with D added, like milk.

In nineteen ninety-seven, the United States Institute of Medicine established levels for how much vitamin D healthy people need. It set the daily amount at two hundred international units from birth through age fifty. It set the level at four hundred I.U.s through age seventy, and six hundred for age seventy-one and over.

But some groups say these amounts are not high enough. They are hoping that the new research findings will lead to new recommendations.

Research in the last several years has shown that low levels of vitamin D may increase the risk of heart attacks in men and deaths from some cancers. Other studies have shown that people with rheumatic diseases often have low levels of vitamin D.

More doctors are now having their patients tested for their vitamin D levels. But as research continues, some experts worry that if people take too much vitamin D, it might act as a poison. Also, skin doctors warn people to be careful with sun exposure because of the risk of skin cancer.

And that’s the VOA Special English Health Report, written by Caty Weaver. I’m Steve Ember.

----------------------------Google Translate

其中维生素署署长，似乎短期内'做了很多'
研究发现，维生素已知为建设强大的骨头，也可能有助于防止许多疾病。全文电台广播：
2008年7月15日

这是美国之音特别英语卫生报告。

维生素D有助于骨骼和肌肉的坐大和健康。低水平的维生素D ，可导致问题，例如佝偻病，畸形，主要是发现在儿童。骨质疏松症，骨骼变薄，是一个常见的问题，作为人民，特别是妇女，年纪。

但越来越多的研究表明，维生素D也可能有助于防止许多疾病。
最简单的方式获得维生素D是由阳光。太阳的紫外线的反应与皮肤细胞产生维生素D ，但很多人担心越来越皮肤癌和皮肤损伤的来自太阳的。因此，他们掩饰他们的皮肤或穿sunblock或留出太阳。

此外，黑暗的人皮肤产生维生素D不足，比较轻的皮肤的人。生产也录得跌幅在较旧的人民和那些生活在北部地区获得少阳光。

没有太多的食物，自然含有维生素D的食物，高维生素在这方面，包括油性鱼类，如鲑鱼，鲔鱼和鲭鱼，鱼肝油。

波士顿大学的研究人员报道，去年养殖鲑鱼只有约四分之一多的维生素D作为野生鲑鱼。

少量的D的牛肉中发现肝，奶酪和蛋黄。和一些人采取营养补充剂含有维生素。但大部分的维生素D在美国国会来自食品与D补充说，像牛奶。

在1997年，美国医学研究院建立了各级有多少维生素D健康人的需要。它设置每日金额在200国际单位，婴儿在出生后通过年龄50 。它设定的水平，在400学生联合会通过年龄70 ，和600年龄71及以上。

但有些团体说，这些数额不够高。他们希望新研究结果将导致新的建议。

研究在过去的几年中已表明，水平低，维生素D可能会增加患心脏病的袭击，男子和死亡从某些癌症。其他一些研究也表明人与风湿性疾病常常有低水平的维生素D

越来越多的医生，现在他们的病人进行测试，他们的维生素D水平。但作为继续研究，有些专家担心，如果人们采取太多的维生素D ，它可能作为毒药。此外，皮肤医生警告人们要小心，与暴露于太阳的，因为风险的皮肤癌。

这是该美国之音特别英语卫生报告，书面，由caty维夫。我史蒂夫ember 。