Yog tias koj xav tau cov tshuaj vitamin D, koj yuav pom ob txoj kev xaiv ntawm cov txee: D2 thiab D3. Cov no yog ob hom ntawm cov tshuaj vitamin D. Yog tias kuv yuav tsum tau xa cov tshuaj vitamin D ntxiv, kuv xav mus rau D3, tab sis nws tsis muaj teeb meem ntau-tom qab tag nrho, D2 tau siv ntau xyoo.
Vitamin D yog ib yam tshuaj los pab koj lub cev nqus thiab siv cov calcium thiab tswj cov calcium hauv koj cov ntshav.
Yog tias koj tsis tau txais cov vitamin D txaus, koj yuav ua rau koj txoj kev pheej hmoo los ntawm cov kab mob hauv cov pob txha los yog lwm cov pob txha tsis muaj zog xws li osteomalacia thiab osteopenia. Vitamin D kuj yog qhov tseem ceeb rau kev noj qab haus huv tiv thaiv kab mob thiab cov hlab ntsha thiab cov leeg mob.
Ib Me ntsis ntawm Vitamin D Biochemistry
Cholecalciferol (uas D3) yog daim ntawm vitamin D pom nyob rau hauv cov tsiaj. Thaum koj cov tawv nqaij raug rau UVB rays ntawm tshav ntuj, koj lub cev hloov ib yam dab tsi uas hu ua 7-Dehydrocholesterol los ntawm ntau cov biochemical cov kauj ruam mus rau cholecalciferol. Tom qab ntawd los ntawm lwm kauj ruam, tus cholecalciferol yuav hloov mus rau calcifediol, uas yog hu ua 25-hydroxyvitamin D3 thiab yog daim ntawv uas kuaj kev ntsuas thaum koj tus kws kho mob txiav txim siab noj tshuaj Vitamin D.
Thaum kawg, koj lub cev hloov calcifediol rau hauv daim ntawv ntawm cov vitamin D (ib qho uas ua hauj lwm) hu ua calcitriol.
Nroj tsuag mus dhau ib txoj kev zoo sib xws, tiam sis tsis yog cholecalciferol, nroj tsuag muaj ergocalciferol (D2).
Cholecalciferol thiab ergocalciferol zoo sib xws thiab thaum xyoo 1920, nws tau pom tias ergocalciferol tau pab rau kev kho mob rickets rau cov me nyuam. Xyoo, ergocalciferol tau raug lees paub tias yog ib daim ntawv ntxiv ntawm cov vitamin D.
Nyob rau xyoo 1980s thiab '90s, cov kws tshawb fawb pom tias daim tsiaj ntawv, D3, tau pab tsim kom muaj cov tshuaj vitamin D3 ntau tshaj (25-hydroxyvitamin D3).
Txij thaum ntawd los ntawm ob qho kev tshawb fawb pom tsis muaj qhov sib txawv ntawm ob hom thiab ib qho peb kuaj tau ceev ceev nrog D3 tshuaj, tab sis cov soj ntsuam ntawm tsis muaj tseeb yog nws tau hloov ntau yam sib txawv.
Vim li cas cov kev tshawb fawb no tau sib txawv li qhov tau tshwm sim? Ntau yam tseem ceeb tuaj yeem cuam tshuam kev tshawb fawb txog hom kab mob no. Ib txoj kev tshawb nrhiav tau ua tiav thaum lub caij ntuj sov thiaj tshav ntuj raug lwm tus tau ua tiav. Thiab tej zaum kev noj haus thiab kev siv cov kev pabcuam kev nojhaus yuav hloov tau cov khoom. Ntxiv rau leej twg yog qhov zoo tshaj plaws ntawm cov neeg tuaj kawm? Cov neeg mob uas mob txha? Mob raum? Cov neeg noj qab nyob zoo, leej twg tsuas yog qis me ntsis hauv vitamin D? Cov neeg laus Cov tub ntxhais hluas? Txiv neej? Cov poj niam? Kev tshawb nrhiav yuav tsis yooj yim vim hais tias kev tshawb pom rau ib pawg ntawm tib neeg yuav zoo ib yam rau lwm tus.
Kuv paub tseeb tias kev tshawb fawb ntau dua yuav ua rau qhov txawv ntawm D2 thiab D3. Tab sis tam sim no, yog tias koj txhawj xeeb txog koj cov tshuaj vitamin D , qhov zoo tshaj plaws ua tau yog mus rau ib tus neeg muab kev pab kho mob kom koj cov ntshav muaj vitamin D soj ntsuam. Yog tias lawv tsis tshua muaj, koj tuaj yeem nqa daim Vitamin D thiab tom qab ob peb lub limtiam, koj cov ntshav tau kuaj xyuas dua yog tias cov tshuaj ua haujlwm.
Nco ntsoov ua raws li cov lus qhia qhia txog kev noj cov tshuaj vitamin D tshwj tsis yog tias koj tus kws kho mob qhia koj txawv.
Qhov chaw:
Armas LA, Hollis BW, Heaney RP. "Vitamin D2 tsis zoo npaum li vitamin D3 rau tib neeg." J Clin Endocrinol Metab. Xyoo 2004 Nov; 89 (11): 5387-91.
Glendenning P, Chew GT, Seymour HM, Gillett MJ, Goldswain PR, Inderjeeth CA, Vasicaran SD, Taranto M, Musk AA, Fraser WD. "Ntshav 25-hydroxyvitamin D ntau hauv cov vitamin D-tsis txaus txhav pob txha lov tom qab supplementation nrog ergocalciferol thiab cholecalciferol." Pob txha. 2009 Nov; 45 (5): 870-5.
Holick MF, Biancuzzo RM, Chen TC, Klein EK, Young A, Bibuld D, Reitz R, Salameh W, Ameri A, Tannenbaum AD. "Vitamin D2 yog zoo li vitamin D3 nyob rau hauv kev tswj cov khoom ntws los ntawm 25-hydroxyvitamin D." J Clin Endocrinol Metab. 2008 Mar; 93 (3): 677-81.
NIH Office of Dietary Pab. "Kev Noj Zaub Mov Ntxiv: Vitamin D."