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标 题: 科普一下维生素D

发信人: VitD (VitD), 信区: HuNan
标  题: 科普一下维生素D
发信站: BBS 未名空间站 (Fri Aug 17 21:01:11 2012, 美东)

前不久湘籍演员李婷因长期罹患乳腺癌病逝,终年42岁, 这一不幸消息让我联想到著
名香港艺人梅艳芳,03年因患子宫癌去世,死时也只40岁。 

最近20年的研究发现癌症与人体维生素D的含量有着直接的关系。我本人主要从事维生
素D的诊断的研究,对维生素D和健康的关系比较了解。下面简单介绍一下维生素D:

Vitamin D 是通过人体中的胆固醇衍生物在皮肤表面经过阳光紫外线作用产生, 
Vitamin D 通过血液在肝脏里酶的作用下氧化变成25-OH-Vitamin D (25-羟基 维D
),然后再进入肾脏进一步氧化生成具有生理活性的1,25-Di-OH-Vitamin D

Vitmain D缺乏会导致婴儿以及老年人的佝偻病, 以及骨质疏松,患各种癌症(尤其是
乳腺癌,子宫癌, 大肠癌)的几率大大增加,与各种免疫疾病以及精神疾病(忧郁症
)都有关系。

多晒太阳,适当补充Vitamin D (每天1000 IU)会提高身体中的Vitmin D.

平时体检时最好做个 Total 25-OH-Vitamin D的检查,如果低于30 ng/ml,那么一定要
服用Vitamin D,并多晒太阳。

很多家庭医生对Vitamin D并不是特别了解,我自己的家庭医生就从来不建议病人做
vitamin D的检测。我第一次要求做,他还不太愿意, 最后结果出来略低于正常值。

有不少医生一旦发现病人的Vitamin D低于20,就会开50,000IU的高剂量处方药,其实
高剂Vitamin D有可能导致中毒。最好每天服用2000IU的Vitmain D. 三个月后
再做检查。  

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