John Myers
Beta-carotene raug ntes nyob rau hauv kev thuam ntawm kev thuam hauv xyoo 1990, tab sis ua tsis ncaj ncees. Raws li lub hauv paus ntawm vitamin A, kev noj haus yog qhov tseem ceeb rau peb lub cev thiab muaj kev nyab xeeb kiag li los ntawm kev noj zaub mov lossis los ntawm cov khoom noj khoom haus qib. Qhov tsis muaj vitamin A tuaj yeem ua rau muaj kev phom sij txog kev noj qab haus huv.
Prof. Hans-Konrad Biesalski ntawm beta-carotene
"Peb tsis tas yuav tiv thaiv peb tus kheej los ntawm beta-carotene ntau dhau, tab sis los ntawm tsawg dhau! Peb tuaj yeem xav txog beta-carotene los ntawm cov khoom noj, cov kua txiv hmab txiv ntoo, lossis cov tshuaj noj kom tsim nyog kom muaj kev nyab xeeb. "
Prof. Hans-Konrad Biesalski los ntawm University of Hohenheim hauv Stuttgart tsis ntev los no tau kos cov lus xaus no ntawm 2nd Hohenheim Nutrition Talks, uas nws tau tuav. Vim tias cov neeg German tsis noj txaus beta-carotene hauv lawv cov zaub mov. Lawv tsis tuaj yeem tau txais txiaj ntsig los ntawm kev tiv thaiv tseem ceeb ntawm cov vitamin A rau kev noj qab haus huv.
Lub tsev kawm ua noj vegan
Koj puas paub tias peb lub tsev kawm ua noj vegan yuav pib thaum lub caij ntuj no xyoo 2022? Tau txais kev cob qhia los ntawm cov kws ua zaub mov vegan - online, tau kawg, thiab ua noj cov zaub mov qab tshaj plaws ntawm vegan txij li tam sim no: noj qab haus huv, nplua nuj nyob hauv cov khoom tseem ceeb, noj qab haus huv, thiab zoo kawg nkaus!
Biesalski thiab lwm tus kws tshaj lij los ntawm cov kws kho mob thiab kev tshawb fawb txog kev noj haus tau thov rau pej xeem kom maj nrawm txhim kho cov khoom ntawm beta-carotene thiab vitamin A hauv lub teb chaws Yelemees. Cov tshuaj vitamins thiab kev tiv thaiv cov zaub mov nrog beta-carotene, xws li "ACE" dej qab zib, kuj ua rau muaj txiaj ntsig zoo rau qhov no nrog cov txiaj ntsig kev noj qab haus huv, tsuav yog qhov ntau npaum li cas ntawm cov vitamin A tsis dhau heev.
Qhov no tau taw qhia los ntawm thoob ntiaj teb nto moo carotenoid thiab vitamin A kws tshawb fawb Dr. Georg Lietz los ntawm British University of Newcastle.
Raws li ntau zaus tham txog kev nyab xeeb ntawm beta-carotene, Biesalski piav qhia tias lo lus nug no tsuas yog tshwm sim rau cov neeg haus luam yeeb ntau heev, tab sis txhua hnub ntau txog 10 milligrams kuj tsis muaj teeb meem rau pawg neeg no.
Kev tsis txaus vitamin A
Rau kev noj qab haus huv ntawm cov pej xeem, ntawm qhov tod tes, tus kws qhia noj zaub mov pom qhov kev pheej hmoo ntawm cov vitamin A tsis txaus nrog qhov tshwm sim tsis zoo, piv txwv li kev tiv thaiv kab mob, nyob rau hauv pem hauv ntej - thiab qhov no yuav tsum tau tawm tsam los ntawm kev noj cov beta txaus. - carotene. Qhov nruab nrab noj txiv hmab txiv ntoo thiab zaub raws li daim siab nyob rau hauv lub teb chaws no tsis txaus rau qhov no, thiab ib tug tseem ceeb nce nyob rau hauv noj yog tsis pom zoo.
Beta-carotene raug ntes nyob rau hauv qhov kev thuam ntawm kev thuam nyob rau xyoo 1990 vim tias, hauv ob txoj kev tshawb fawb, kev noj cov carotenoid mus ntev heev (10 mus rau 15 npaug ntawm qhov pom zoo noj txhua hnub) ua rau muaj kev pheej hmoo ntawm mob ntsws cancer. thiab kev tuag hauv cov neeg haus luam yeeb hnyav tau muaj.
"Kev tshawb fawb, uas tau cia siab rau lub sijhawm kom muaj beta-carotene ua ib qho txuj ci tseem ceeb kho rau kev phom sij ntawm kev haus luam yeeb, poob siab,"
Raws li Biesalski. Kev haus luam yeeb nws tus kheej yog qhov txaus ntshai tiag tiag. Tsis muaj kev cuam tshuam tsis zoo rau cov neeg tsis haus luam yeeb. Rau cov no, pro-vitamin A yog kiag li tsis muaj teeb meem thiab kev noj qab haus huv-kev txhawb nqa thiab rau cov neeg haus luam yeeb nyob rau hauv me me koob tshuaj txog li 10 mg ib yam nkaus, uas kuj tau lees paub los ntawm cov nqe lus ntawm lwm tus neeg hais lus.
Ntuj tiv thaiv daim tawv nqaij
Hauv daim tawv nqaij, piv txwv li, beta-carotene tiv thaiv kev puas tsuaj uas tuaj yeem tshwm sim los ntawm kev raug tshav ntuj. Raws li Prof. Helmut Sies, Düsseldorf University Tsev Kho Mob, cov duab-oxidative kev ntxhov siab no tuaj yeem ua rau cov carotenoid neutralized.
Dr Andrea Krautheim - yav dhau los ua haujlwm hauv University of Göttingen - tshaj tawm, ntawm lwm yam, tias kev sib xyaw ntawm beta-carotene thiab lwm yam carotenoids tuaj yeem muaj txiaj ntsig zoo rau ntawm daim tawv nqaij, tab sis qhov beta-carotene ib leeg tsis tuaj yeem lav "kev tiv thaiv daim tawv nqaij los ntawm nyob rau hauv "tiv thaiv UV hluav taws xob yuav.
Beta-carotene - qhov tseem ceeb rau kev muab cov vitamin A
Tsis tas li ntawd, beta-carotene yog ib qho tseem ceeb heev raws li ib tug precursor (pro-vitamin) ntawm vitamin A, uas lub cev xav tau rau lub cev tsis muaj zog, thiab lwm yam. Cov neeg German tau txais yuav luag 50 feem pua ntawm lawv cov vitamin A muab los ntawm cov vitamin pro.
Cov kev tshawb fawb xws li kev tshawb fawb txog kev noj haus hauv teb chaws tsis ntev los no NVS II tau pom tias feem ntau ntawm cov neeg German tsis haus cov vitamin A txaus nrog lawv cov zaub mov. "Txog 70 feem pua ntawm cov vitamin A hauv lub teb chaws Yelemees yuav tsum tau ua kom ntseeg tau los ntawm beta-carotene," piav qhia Biesalski.
Lub koom haum German Nutrition Society (DGE) pom zoo kom noj txhua hnub ntawm 0.8 txog 1.0 mg ntawm vitamin A (retinol) rau cov neeg laus noj qab haus huv - xws li retinol sib npaug, uas kuj suav nrog cov vitamin A. Yuav kom ua tiav qhov txiaj ntsig no, Biesalski thiab Sies pom zoo kom noj 2-4 mg ntawm beta-carotene txhua hnub.
Cov pej xeem nruab nrab tseem nyob qis dua cov lus pom zoo no thiab yog li ua rau muaj kev phom sij txog kev noj qab haus huv nyob deb. Feem coob ntawm cov neeg German tseem noj txiv hmab txiv ntoo thiab zaub tsawg dhau (beta-carotene qhov chaw) lossis daim siab thiab lwm cov vitamin A. Nws tsis yog pom tau tias qhov kev noj ntawm cov zaub mov no tuaj yeem nce ntxiv mus li cas.
Vitamin A tsis txaus vim beta-carotene-dependent gene variant
Tib yam siv rau Great Britain, tshaj tawm Lietz. Nws pab neeg tshawb fawb kuj tau qhia thawj zaug tias nyob ib ncig ntawm 40 feem pua ntawm tag nrho cov neeg nyob sab Europe muaj cov kab mob sib txawv uas tsuas yog siv beta-carotene hauv lub cev rau qhov txwv, xws li B. tuaj yeem hloov mus rau hauv vitamin A. Ntau tus kws tshaj lij tsis ntseeg tias tam sim no siv tau. Kev hloov pauv ntawm 1: 6 (los tsim ib qho molecule ntawm vitamin A, kev noj ntawm 6 molecules ntawm beta-carotene yog tsim nyog) yog qhov tseeb.
Feem ntau hais lus rau qhov sib piv ntawm 1: 12, uas sib haum mus rau qhov pom zoo kom noj approx. 7 mg beta-carotene ib hnub twg. Raws li Lietz, yog hais tias ib tug yuav tsum coj mus rau hauv tus account lub genetic txwv beta-carotene siv, ces qhov pom zoo noj txhua hnub yuav txawm yog 22 mg. Kev tshawb nrhiav ntxiv rau qhov no tam sim no tab tom ua.
Ib qho txaus ntawm beta-carotene / vitamin A tuaj yeem tiv thaiv kab mob sib kis
Hauv kev sib tham tom qab ntawd, nws tau hais kom ua tib zoo saib xyuas qhov txaus ntawm beta-carotene thiab vitamin A, tshwj xeeb tshaj yog nyob rau lub caij ntuj sov thiab lub caij ntuj no, txhawm rau txhawm rau txhim kho lub cev tiv thaiv kab mob kom tsis txhob mob khaub thuas tshwj xeeb. Raws li Lietz, lub hom phiaj tseem ceeb yog kev noj zaub mov kom zoo, yog li qhov sib txawv tau (xws li kev noj cov txiv hmab txiv ntoo tsis txaus, zaub, lossis daim siab) yuav tsum raug kaw nrog cov khoom noj uas tsim nyog.
Ntau lub hom phiaj tsis yog cov lus ceeb toom tsis muaj vitamin
Lietz hais ntxiv tias kev qhia cov pej xeem txog cov kev xav tau thiab cov txiaj ntsig ntawm micronutrients xws li beta-carotene feem ntau ua los ntawm cov kws sau ntawv noj zaub mov uas muab cov ntaub ntawv lub hom phiaj.
Cov lus tshaj tawm zoo siab uas muaj nyob hauv lub teb chaws Yelemees hauv cov ntsiab lus no, uas nyob rau hauv cov ntaub ntawv ntawm beta-carotene feem ntau ceeb toom tawm tsam kev siv tshuaj ntxiv - yam tsis muaj kev txwv rau cov pab pawg txaus ntshai lossis ntau npaum li cas - yuav ua rau tsis muaj kev ntxhov siab thiab ntshai ntau tus neeg.
Cov kws tshawb fawb tsis yog tsawg kawg yog lub luag haujlwm rau cov lus ceeb toom txaus ntshai tsis tu ncua txog kev phom sij uas xav tias yuav tawm los ntawm cov vitamins. Cov no yuav nce ntxiv kom ua tiav cov ntawv tshaj tawm los ntawm cov kev xav zoo nkauj uas yog ua raws li kev soj ntsuam kev tshawb fawb dawb huv lossis kev sim tube sim yam tsis muaj pov thawj.
