在线听写:VOA慢速新闻：维生素D的重要作用 - 爱思英语在线听写频道 - 在线听写- 英语听力- 听力下载- 听力视频,练听力从爱思听写开始

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This is the VOA Special English Health Report.		这里是VOA 特别英语健康报道。
Vitamin D helps bones and muscles grow strong and healthy.		维生素D 帮助骨骼和肌肉更加强壮，更加健康地生长。
Low levels of vitamin D can lead to problems like rickets and osteoporosis.		维生素D 水平低会导致软骨病和骨质疏松症。
Rickets is a deformity mainly found in children. Osteoporosis is the thinning of bone,		软骨病是主要发生在儿童群体中的身体畸形。骨质疏松症指的是骨质稀薄，
a common problem as people, especially women, get older.		在人们，尤其是女性变老的过程中出现的常见问题。
Studies in recent years have suggested that vitamin D may also have other uses.		近几年来的研究表明，维生素D 可能还有其他用途。
Studies have shown that low levels of D may increase the risk of heart attacks in men and deaths from some cancers.		研究表明，维生素D 水平低可能会增加男子心脏病发和因某些癌症死亡的险。
Other studies have shown that people with rheumatic diseases often have low levels of D.		其他研究表明，患有风湿病的人维生素D 水平通常比较低。
The easiest way to get vitamin D is from sunlight. The ultraviolet rays react with skin cells to produce the vitamin.		获得维生素D 最简单的途径是从阳光中获得。紫外线与皮肤细胞反应生成维生素。
But many people worry about skin cancer and skin damage from the sun.		但是许多人担心接受太多日照容易患皮肤癌，或皮肤受伤。
Also, darker skinned people produce less vitamin D than lighter skinned people.		同时，肤色较深的人体内生成的维生素D 少于肤色较浅的人。
Production also decreases in older people and those living in northern areas that get less sunlight.		老年人和居住在日照较少的北方的人维生素的生成量也减少。
Not many foods naturally contain vitamin D. Foods with high levels include oily fish such as salmon, tuna and mackerel, and fish liver oils.		天然含有维生素D 的食物并不是很多。维生素D 含量比较高的食物包括鲑鱼，金枪鱼和鲭等脂肪含量比较高的鱼以及鱼肝油。
Boston University researchers reported in two thousand seven that farmed salmon had a lot less vitamin D than wild salmon.		2007年，波士顿大学研究人员报道称，饲养的鲑鱼含有的维生素D 远远低于野生鲑鱼。
Small amounts of D are found in beef liver, cheese and egg yolks.		牛肝，奶酪和蛋黄内也含有少量的维生素D。
And some people take dietary supplements containing the vitamin.		一些人会食用含有维生素的食物增补剂。
But most of the D in the American diet comes from foods like milk with the vitamin added.		但是美国饮食中大部分维生素D 来自添加了维生素的牛奶等食物。
These days, more doctors are testing for vitamin D levels in their patients.		近日来，越来越多的医生会检测病人体内维生素D 的含量。
But as research continues, some experts worry that if people take too much D, it might act as a poison.		但是随着研究工作继续进行，一些专家担心，如果人们摄入过量的维生素D，可能会产生毒副作用。
Also, skin doctors warn people to be careful with sun exposure.		同时，皮肤科专家提醒人们不要过分暴露在日晒环境下。
How much vitamin D does a healthy person need? Nutrition experts who advise the American government set the current recommendations in nineteen ninety-seven.		那么，健康人需要多少维生素D 呢？美国政府营养专家在1997 年推出了目前的建议。
The daily amount is two hundred international units from birth through age fifty.		从刚出生到15 岁的孩子每天的摄入量为200 个国际单位，
Then it rises to four hundred I.U.s through age seventy, and six hundred for those seventy-one and older.		从15 岁到70 岁则上升到400 个国际单位，71 岁及以上的人则需要600 个单位。
But some groups say these amounts are not high enough.		但是一些组织称这些摄入量还不够。
The nutrition experts are taking another look at how much vitamin D and calcium people should get.		营养专家正在重新研究人体应该摄入多少维生素D 和钙。
The Institute of Medicine of the National Academies expects to release a report by this coming May.		美国国家医学院预期在即将到来的五月份发表相关报道.
And that's the VOA Special English Health Report, written by Caty Weaver. I'm Bob Doughty.		这里是VOA 特别英语健康报道。

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