为什么要补充维生素?

维生素既不像蛋白质一样,可以构成身体和生命活性物质;也不像脂肪和糖一样,可为人体提供能量。但一旦缺了维生素,身体构成和能量供给都会出现异常,甚至中断。

身体对维生素的需要量很小,通常用毫克甚至微克这样小的单位来计算其数量。但是,人体内却不能合成,或合成量不足,因此必须经常由食物或维生素制剂作外源性补充。

维生素的种类很多,在饮食中有20多种,按照溶解性质可分为两大类:

  • 水溶性维生素:能溶解于水而不溶解于脂肪的维生素称为水溶性维生素,包括维生素C和所有的B族维生素。
  • 脂溶性维生素:不溶解于水而溶解于脂肪的叫脂溶性维生素,包括维生素A、D、E、K。

长期摄入维生素不足或因其他原因无法满足生理需要时,可影响机体的正常生理功能。如果严重维生素不足的状态持续发展下去,可导致一系列临床症状,如夜盲症、佝偻病、脚气病等。

从理论上讲,如果我们的膳食能做到全面、均衡、适度,例如一般每天吃5~6两主食、1杯牛奶、1个鸡蛋、3两肉、1~2两豆制品、1斤左右的蔬菜、水果和半两左右的植物油等,那么,每日所需的热量和营养素(包括各类维生素)就不致缺乏,也就无需再靠其他方法补充。

然而,实际情况往往不那么理想,我们往往难以避免下面的问题,如:

  • 食品在储备、加工、烹调过程中,必然有营养素,特别是维生素的损失,在某些情况下,如烹调火候过大、时间过长等,会损失很多维生素
  • 很多人存在程度不同的偏食,如不爱吃水果、青菜等,有的则是食物种类不够广泛,长期摄食几种固定的食物,造成维生素的摄入不均衡
  • 很多疾病,如消化不良等,会影响膳食中维生素的吸收和利用
  • 在某些特殊情况下,如妊娠、哺乳等,可造成维生素的需要量增加,单靠食物供给有数量不足之嫌

因此,对大多数人而言,在平衡膳食的基础上,科学地补充维生素是需要的

 查看维生素产品列表

18 comments

  • Comment Link anabole steroide bestellen 星期六, 22 2月 2020 00:10 anabole steroide bestellen

    I besides think thence, perfectly pent post! .

    https://tysonc.net/

  • Comment Link anabolic steroids for sale 星期五, 21 2月 2020 21:10 anabolic steroids for sale

    Whats up are using Wordpress for your blog platform? I'm new to the blog world but I'm trying to get started and set up my own. Do you require any coding expertise to make your own blog? Any help would be greatly appreciated!

    https://www.roidsmarket.net/

  • Comment Link Acquistare Reductil 星期五, 21 2月 2020 17:00 Acquistare Reductil

    Very interesting topic, appreciate it for putting up.

    https://reductil.shop/it/index.html

  • Comment Link Comprar Phentermine HCL en línea 星期五, 21 2月 2020 14:27 Comprar Phentermine HCL en línea

    Heya i am for the first time here. I found this board and I find It really useful & it helped me out a lot. I hope to give something back and help others like you helped me.

    https://www.phentermine-375.com/es/index.html

  • Comment Link Acheter Melanotan 2 en ligne 星期五, 21 2月 2020 11:19 Acheter Melanotan 2 en ligne

    Hey there! I just wanted to ask if you ever have any issues with hackers? My last blog (wordpress) was hacked and I ended up losing many months of hard work due to no data backup. Do you have any methods to stop hackers?

    https://mt-2.shop/fr/index.html

  • Comment Link steroide kaufen 星期五, 21 2月 2020 09:25 steroide kaufen

    obviously like your web-site but you have to test the spelling on quite a few of your posts. Many of them are rife with spelling problems and I in finding it very troublesome to inform the truth nevertheless I will surely come back again.

    https://levelextreme.net/

  • Comment Link Adipex Online Kaufen 星期五, 21 2月 2020 05:47 Adipex Online Kaufen

    I would like to thnkx for the efforts you've put in writing this website. I'm hoping the same high-grade web site post from you in the upcoming as well. Actually your creative writing skills has inspired me to get my own web site now. Really the blogging is spreading its wings rapidly. Your write up is a great example of it.

    https://jetzabnehmen.net/adipex-retard-kaufen

  • Comment Link adipex kaufen 星期五, 21 2月 2020 03:10 adipex kaufen

    I gotta favorite this site it seems very beneficial very useful

    https://www.gewichtverlieren.shop/

  • Comment Link Buy Insulin For Diabetic Online 星期四, 20 2月 2020 23:40 Buy Insulin For Diabetic Online

    I'm not sure why but this weblog is loading extremely slow for me. Is anyone else having this problem or is it a problem on my end? I'll check back later and see if the problem still exists.

    https://europeansteroids.com/en/insulin

  • Comment Link steroide kaufen 星期四, 20 2月 2020 22:15 steroide kaufen

    It¦s really a nice and useful piece of info. I¦m happy that you shared this helpful info with us. Please keep us informed like this. Thanks for sharing.

    https://best-globalpharma.org/

Leave a Reply

Your email address will not be published. HTML code is not allowed.