维生素D "阳光维生素"
文章来源:未知 文章作者:enread 发布时间:2022-12-12 08:03 字体: [ ]  进入论坛
(单词翻译:双击或拖选)
多年前,科学家就发现晒太阳可以补充维生素D。当人体皮肤表层的7-脱氢胆固醇遇到阳光里的紫外线后,就会生成这种维生素。人体内源性维生素D约80%在皮肤表皮合成,仅20%从食物中摄取,所以维生素D也被称为"阳光维生素"。
 
The connection between sunlight and bone health was made over 200 years ago when a Polish doctor treated inner city children with rickets1 (or soft bones) by taking them to the countryside for the summer months. In fact, vitamin D promotes heart, metabolic2, and immune system health in addition to supporting bone health.
200多年前,当一位波兰医生带着患有佝偻病(或软骨头)的城市儿童去乡下避暑时,发现了阳光与骨骼健康之间的联系。事实上,维生素D除了有益骨骼健康外,还对心脏、新陈代谢和免疫系统健康有益。
 
Vitamin D is absorbed into our bloodstream and converted to the active form (a secosteroidal hormone3) and a storage form (25-hydroxyvitamin D) – it functions more like a hormone than a vitamin. So, it is no surprise that having sufficient levels of vitamin D is so important for a broad array of health effects.
维生素D被血液吸收,并转化为活性形式(一种开环甾体激素)和储存形式(25-羟基维生素D)——其功能更像是一种激素而不是维生素。因此,充足的维生素D对健康有着重要影响。
 
Potential benefits associated with vitamin D include:
维生素D的潜在健康益处包括:
Aids in calcium4 absorption for maintaining strong bones and teeth
促进钙吸收,保持骨骼和牙齿强健
Helps support healthy heart and immune function
有益心脏健康和增强免疫功能
Facilitates healthy cell development
促进健康的细胞发育
 
值得注意的是,只有裸露的皮肤接受太阳光照射的时候才能产生维生素D。因此,冬天更需要多晒太阳,才能补充充足的维生素D。
 
晒太阳的时间需要多久?
 
冬春季,将面部和双上臂暴露于阳光下 10~30 分钟,夏季由于紫外线较强,裸露部位较多,接受太阳直射 5~10 分钟,每周 2~3 次就能让身体产生足够的维生素 D。绝大多数人每天在阳光下晒 10 至 20 分钟即可。
 
隔着玻璃晒太阳有效吗?
 
隔着玻璃晒太阳会大大降低效果,因为中波紫外线 UVB 的穿透性比较差。在家中隔着玻璃晒太阳几乎是无效的,因为中波紫外线的透过率会大幅度降低,从而影响人体合成维生素 D。晒太阳的最佳地点是户外,因各种原因必须在室内晒太阳,也一定要打开窗子,让阳光直接与皮肤接触。
 
"Vitamin D is produced when sunlight touches our skin, and very few foods in nature contain vitamin D, with fortified5 foods – primarily cow's milk – being responsible for most of the vitamin D in the American diet," said Jamie McManus, Shaklee's Chair of Medical Affairs. "As daylight savings6 time ends, we have less opportunity to absorb vitamin D through sunlight. Therefore, people should supplement their vitamin D intake7, especially during winter."
美国营养品公司嘉康利医学事务主席杰米·麦克马纳斯称:“当阳光照射皮肤时,人体就会产生维生素D,自然界中含有维生素D的食物较少,而牛奶是美国人饮食中维生素D的主要来源。随着夏令时间结束,通过阳光吸收维生素D的机会减少。因此,人们应该补充维生素D摄入量,尤其是在冬季。”


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1 rickets 4jbzrJ     
n.软骨病,佝偻病,驼背
参考例句:
  • A diet deficient in vitamin D may cause the disease rickets.缺少维生素D的饮食可能导致软骨病。
  • It also appears to do more than just protect against rickets.除了防止软骨病,它还有更多的功能。
2 metabolic 2R4z1     
adj.新陈代谢的
参考例句:
  • Impressive metabolic alternations have been undergone during embryogenesis.在胚胎发生期间经历了深刻的代谢变化。
  • A number of intoxicants are associated with metabolic acidosis.许多毒性物质可引起代谢性酸中毒。
3 hormone uyky3     
n.荷尔蒙,激素,内分泌
参考例句:
  • Hormone implants are used as growth boosters.激素植入物被用作生长辅助剂。
  • This hormone interacts closely with other hormones in the body.这种荷尔蒙与体內其他荷尔蒙紧密地相互作用。
4 calcium sNdzY     
n.钙(化学符号Ca)
参考例句:
  • We need calcium to make bones.我们需要钙来壮骨。
  • Calcium is found most abundantly in milk.奶含钙最丰富。
5 fortified fortified     
adj. 加强的
参考例句:
  • He fortified himself against the cold with a hot drink. 他喝了一杯热饮御寒。
  • The enemy drew back into a few fortified points. 敌人收缩到几个据点里。
6 savings ZjbzGu     
n.存款,储蓄
参考例句:
  • I can't afford the vacation,for it would eat up my savings.我度不起假,那样会把我的积蓄用光的。
  • By this time he had used up all his savings.到这时,他的存款已全部用完。
7 intake 44cyQ     
n.吸入,纳入;进气口,入口
参考例句:
  • Reduce your salt intake.减少盐的摄入量。
  • There was a horrified intake of breath from every child.所有的孩子都害怕地倒抽了一口凉气。
TAG标签: healthy hormone vitamin
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