一、維生素作用是什么
維生(sheng)(sheng)(sheng)素(su)是人和動物(wu)為維持正常的(de)(de)生(sheng)(sheng)(sheng)理功能(neng)而必須從食物(wu)中(zhong)(zhong)獲得(de)的(de)(de)一(yi)類微量有機物(wu)質,在人體生(sheng)(sheng)(sheng)長、代謝、發(fa)育(yu)過程(cheng)中(zhong)(zhong)發(fa)揮著重(zhong)要的(de)(de)作用。維生(sheng)(sheng)(sheng)素(su)既不(bu)(bu)參與(yu)構成人體細胞,也不(bu)(bu)為人體提供能(neng)量,而是一(yi)類調節物(wu)質,在物(wu)質代謝中(zhong)(zhong)起重(zhong)要作用。
二、維生素的分類及特點
維生(sheng)素分(fen)為水(shui)溶性(xing)和脂溶性(xing)兩大(da)類。
水溶性:維(wei)(wei)生素(su)B1、維(wei)(wei)生素(su)B2、維(wei)(wei)生素(su)B6、維(wei)(wei)生素(su)B12、煙酸(suan)、維(wei)(wei)生素(su)C、葉酸(suan)等(deng)等(deng)。
脂溶性:維生(sheng)素(su)(su)A、維生(sheng)素(su)(su)D、維生(sheng)素(su)(su)E、維生(sheng)素(su)(su)K ? ?維生(sheng)素(su)(su)A有促進(jin)生(sheng)長,維持上皮(pi)組織如皮(pi)膚(fu)、結膜(mo)(mo)、角膜(mo)(mo)等正(zheng)常功能的(de)作用,并參與(yu)紫(zi)紅質的(de)合(he)成,增強視網膜(mo)(mo)感光力,參與(yu)體內許多氧(yang)化(hua)過程,尤其是(shi)不飽(bao)和脂肪酸(suan)氧(yang)化(hua)。
三、維生素的共同特點
1、維生(sheng)素或(huo)者其前體都在(zai)天然(ran)食(shi)物中存在(zai),但從未有(you)一種天然(ran)食(shi)物含有(you)人體所需的(de)全部維生(sheng)素。
2、在體內(nei)既(ji)不供給熱(re)能(neng),也不構成機體組織(zhi)。
3、每日需要量極少,通常以毫克,甚至微克計。但卻是維持(chi)機(ji)體的(de)正常生理功能所(suo)必需。
4、在(zai)體內不能合(he)成或者合(he)成的(de)數(shu)量不能滿足機體的(de)需要,必須由食物供給。
四、維生素是(shi)飯前(qian)吃還是(shi)飯后吃
不同的維生素服用的時間不一樣,都是都不適合在空腹的時候吃,因為空腹的時候,胃腸道里沒有食物,會被腸道迅速吸收,導致維生素在血液中的含量過高,會在沒有被人體利用前就經過腎臟和尿道排出體外,所以一般都是在飯后吃。維生素在選擇上注意兩點:1?看品牌,選擇大的維生素品牌,質量好,效果佳;2、看平臺,資質是(shi)否齊(qi)全(quan)、是(shi)否有追溯機制,是(shi)否與消費者站在一起,售后有保障。
五、維生素(su)怎么搭(da)配吃最(zui)好
維(wei)(wei)(wei)(wei)(wei)(wei)生(sheng)(sheng)(sheng)(sheng)(sheng)素(su)(su)(su)(su)(su)(su)A與(yu)維(wei)(wei)(wei)(wei)(wei)(wei)生(sheng)(sheng)(sheng)(sheng)(sheng)素(su)(su)(su)(su)(su)(su)E同時服(fu)用(yong),可(ke)防(fang)止維(wei)(wei)(wei)(wei)(wei)(wei)生(sheng)(sheng)(sheng)(sheng)(sheng)素(su)(su)(su)(su)(su)(su)A被氧(yang)(yang)化而失去作用(yong),這是(shi)因(yin)為維(wei)(wei)(wei)(wei)(wei)(wei)生(sheng)(sheng)(sheng)(sheng)(sheng)素(su)(su)(su)(su)(su)(su)E更容(rong)易與(yu)氧(yang)(yang)結合(he),維(wei)(wei)(wei)(wei)(wei)(wei)生(sheng)(sheng)(sheng)(sheng)(sheng)素(su)(su)(su)(su)(su)(su)E會(hui)比維(wei)(wei)(wei)(wei)(wei)(wei)生(sheng)(sheng)(sheng)(sheng)(sheng)素(su)(su)(su)(su)(su)(su)A先氧(yang)(yang)化,維(wei)(wei)(wei)(wei)(wei)(wei)生(sheng)(sheng)(sheng)(sheng)(sheng)素(su)(su)(su)(su)(su)(su)A就(jiu)可(ke)免(mian)受氧(yang)(yang)化的影(ying)響了。維(wei)(wei)(wei)(wei)(wei)(wei)生(sheng)(sheng)(sheng)(sheng)(sheng)素(su)(su)(su)(su)(su)(su)E與(yu)維(wei)(wei)(wei)(wei)(wei)(wei)生(sheng)(sheng)(sheng)(sheng)(sheng)素(su)(su)(su)(su)(su)(su)C一(yi)同服(fu)用(yong),效果會(hui)得(de)到很大的提高。 此外,維(wei)(wei)(wei)(wei)(wei)(wei)生(sheng)(sheng)(sheng)(sheng)(sheng)素(su)(su)(su)(su)(su)(su)E與(yu)維(wei)(wei)(wei)(wei)(wei)(wei)生(sheng)(sheng)(sheng)(sheng)(sheng)素(su)(su)(su)(su)(su)(su)B一(yi)起(qi)服(fu)用(yong),維(wei)(wei)(wei)(wei)(wei)(wei)生(sheng)(sheng)(sheng)(sheng)(sheng)素(su)(su)(su)(su)(su)(su)E的抗氧(yang)(yang)化的作用(yong),將會(hui)得(de)到強化。因(yin)此,服(fu)用(yong)維(wei)(wei)(wei)(wei)(wei)(wei)生(sheng)(sheng)(sheng)(sheng)(sheng)素(su)(su)(su)(su)(su)(su)E,最好(hao)能(neng)與(yu)含維(wei)(wei)(wei)(wei)(wei)(wei)生(sheng)(sheng)(sheng)(sheng)(sheng)素(su)(su)(su)(su)(su)(su)C與(yu)維(wei)(wei)(wei)(wei)(wei)(wei)生(sheng)(sheng)(sheng)(sheng)(sheng)素(su)(su)(su)(su)(su)(su)B一(yi)起(qi)服(fu)用(yong)。