英语翻译Millions of Americans take large amounts of vitamin C pi

英语翻译
Millions of Americans take large amounts of vitamin C pills every day because they believe the vitamin will help them stay healthy.However,a new study says vitamin (2 may help produce substances that can damage DNA.Scientists at the University of Pennsylvania experimented with vitamin C in test tubes.They studied the effect of vitamin C on a substance produced in the body from fat.That substance is called hydroperoxide (氢过氧化物) ,which can be changed in a cell into substances that can damage DNA.The scientists found that vitamin C easily changed the hydroperoxide into the gene-damaging poisons.Such damage is the first step towards developing cancer.
However,the sa.cientists say the study does not mean that vitamin C causes cancer.They say it is well-known that vitamin C is important for human health,but people can get enough vitamin C in the foods they eat.Earlier studies have shown that eating a lot of fruits,vegetables and grains can reduce the chance of developing both heart disease and cancer.
Other researchers agree that the latest study is important in understanding the chemistry of vitamin C.But they say the study did not involve people.The vitamin C was tested in the laboratory only.They think the results might be different in living cells.
Mark Levine is a vitamin C expert who questions whether a similar study in people would produce the same results.He also says people should get their vitamin C in food instead of taking huge amounts in pills to stay healthy,and research does not support taking a lot of vitamin C.
The United States government says people should get about eighty milligrams of vitamin C each day in the foods they eat.Studies have shown that the body cannot use more than two hundred milligrams of vitamin C each day.Medical researchers say that taking vitamin C pills cannot replace the value of eating healthy foods.

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数百万的美国人每一天服用大量的维生素C丸,因为他们相信,维生素可以帮助他们保持健康.然而,一项新的研究表明,维生素C会对DNA产生损伤.宾夕法尼亚大学的科学家对试验试管中的维生素C物质进行了研究.他们研究了维生素C对人体产生影响的脂肪物质.这种物质被称为氢过氧化物（氢过氧化物）,它可以破坏一个细胞的DNA物质改变.科学家们发现,维生素C中的氢过氧化物很容易转变成破坏基因的毒药.这种损害是患癌的第一步.

然而,科学家称,该研究并不意味着维生素C会导致癌症.他们说,众所周知,维生素C对人体健康是重要的,但人们他们吃的食物中可以得到含有足够的维生素C.先前的研究已经表明,多吃水果,蔬菜和谷物可以减少患心脏病和癌症的机会.其他研究人员认为,最新的研究,研究维生素C的化学性很重要,但他们说,这项研究结果并没有涵盖人类.维生素C的研究只是在实验室进行.他们认为在活细胞中,结果可能会不同.

马克·莱文是一位对维生素C研究质疑的专家人,他认为在细胞中也会产生同样的结果.他还说,人们应该从食物中摄取维生素C,而不是大量的服用这些药丸食品来保持健康,研究结果不支持服用大量的维生素C.美国政府表示,人们每一天在食物中摄取的维生素C应为八十毫克.研究表明,人体每一天不能使用超过二百毫克的维生素C.医学研究人员说,服用维生素C丸不能代替吃健康食品的价值.