Kristen Cook
Ingabe ubisi lwe-A2 lubekezelelwa kangcono kunobisi olujwayelekile kubantu abanokungabekezelelani kwe-lactose? Nali iqiniso.
Ubisi - noma umbuzo wokuthi ubisi olunempilo kangakanani emzimbeni womuntu - kungenye yezindaba eziphikisana kakhulu emphakathini wethu. Lokhu kungenxa yokuthi ubisi lubhekwa njengokungagayeki kahle futhi abantu abaningi bakhononda ngokungabekezelelani kwe-lactose noma ukungezwani ne-lactose.
Livelaphi igama elithi A2 milk?
Sekuyiminyaka, ubisi lwe-A2 lubhekwa njengohlobo lobisi oluyisimangaliso. Ngenxa yokwanda kokubekezelelana kwayo, ngisho nabantu abanokungabekezelelani kwe-lactose kufanele bakwazi ukuphuza ubisi lwe-A2 ngaphandle kwezinkinga. Ubisi olujwayelekile, olwaziwa nangokuthi ubisi lwe-A1, kuthiwa ludala izinkinga zokugaya ukudla.
Kodwa imeleni i-A1 ne-A2? Ukuze uqonde lokhu, kufanele uhlolisise izingxenye zobisi lwenkomo.
Ngaphezu kwamanzi namafutha, ubisi luqukethe amaprotheni, okungukuthi amaprotheni. I-Beta-casein yakha ingxenye enkulu yalawa maprotheni. I-A1 ne-A2 yizinhlobonhlobo ezimbili ze-beta-casein ezitholakala kakhulu obisini lwenkomo.
Ukuthi inkomo inika ubisi lwe-A1, ubisi lwe-A2, noma uhlobo oluxubile kunqunywa ukwakheka kofuzo lwesilwane futhi ngeke kuthonywe ngaphandle. Abacwaningi basola ukuthi ekuqaleni zonke izinkomo zazinikeza ubisi lwe-A2 nokuthi i-A1 yaqala ukusungulwa ngokuguquguquka kwezinhlobo zaseYurophu.
Yiziphi izinkomo ezinikeza ubisi lwe-A2?
Amafrikhwensi aphezulu e-A2 angatholakala ezinhlotsheni zezinkomo zaseGuernsey, Jersey, kanye naseBrown Swiss, phakathi kwezinye.
Uyini umehluko phakathi kobisi lwe-A1 no-A2?
Kuye kwafakazelwa ngokwesayensi ukuthi ubisi lwe-A1 no-A2 luyehluka ngesikhathi esisodwa ekubunjweni kwalo. I-Casein ngokuvamile yakhiwa ama-amino acid akha amaketanga. Esimeni sama-67 sale amino acid, iketango yi-amino acid proline obisini lwe-A2. I-amino acid histidine itholakala lapha obisini lwe-A1.
Ingabe ubisi lwe-A2 lunempilo ngempela?
Phakathi nenqubo yokugaya ubisi lwe-A1, i-beta-casein iphukile futhi i-beta-casomorphin-7 (BCM-7) ikhiqizwa emgudwini wokugaya ukudla. Sekuyiminyaka le nto ihlotshaniswa nezifo ezifana nesifo sikashukela sohlobo loku-1, isifo senhliziyo, kanye ne-autism. Njengoba i-BCM-7 ingakhiqizi noma ingakhiqizi nhlobo ngesikhathi sokugaya ubisi lwe-A2, abasekeli bakuthatha njengokusho ukuthi ubisi lwe-A2 lunempilo kunobisi lwe-A1. Iqiniso liwukuthi, azikho izifundo zesayensi ezifakazela ukuxhumana phakathi kobisi lwe-A1 kanye nezifo ezishiwo.
Ingabe ubisi lwe-A2 luyaludinga?
Eminyakeni yamuva nje, izifundo ezihlukahlukene zigxile embuzweni wokuthi ubisi lwe-A2 kulula yini ukubekezelela kunobisi lwe-A1. I-Bavarian State Institute for Agriculture icaphuna ezifundweni ezimbili ezincane ezivela e-Asia, lapho ababambiqhaza abangabekezeleli ubisi babe nezimpawu ezimbalwa ngobisi lwe-A2 kunobisi lwe-A1. Ngenani labantu abahlolwayo labantu abangama-41 kanye nabantu abangama-45, lezi zifundo azinangqondo neze.
Isiphetho ekhasini eliyisiqalo le-LfL sithi:
“Ubisi lwezinkomo zethu seluvele luqukethe i-A65 casein engamaphesenti angama-80 kuye kwangama-2. Ukukhubazeka okukhulu kwezempilo okuvela ekusetshenzisweni kobisi oluqukethe i-A1 kungakhishwa ngokuqiniseka ngemva kokucaciswa ngokucophelela yizikhungo ezidumile zaseYurophu. Ngokwemiphumela etholakalayo yezinkinga zokugaya ukudla ezibangelwa ubisi oluqukethe i-A1, ubisi oluhlanzekile lwe-A2 lungaba umkhiqizo othakazelisayo ezimakethe zase-Asia. Kodwa-ke, lokhu kusebenza ngokuyinhloko ekuphuzeni ubisi, imikhiqizo kashizi neminye imikhiqizo yobisi ayikacaciswa. Ukuthi imiphumela inanoma yikuphi ukuhambisana nemakethe yaseYurophu ngeke kushiwo okwamanje, kungadingeka izifundo zase-Europe kulokhu. ”
I-Max Rubner Institute, esebenze kakhulu obisini lwe-A2, nayo ifinyelela esiphethweni sokuthi i-hype mayelana nobisi okuthiwa lugayeka kangcono alufanelekile. Ekhasini eliyisiqalo lithi:
“Isitatimende esingafundwa ngezikhathi ezithile kwabezindaba mayelana nokubekezelelana okungcono kobisi lwe-A2 esimweni sokungabekezelelani kwe-lactose asinaso isisekelo sesayensi. Ubisi lwe-A2 aluhlukanga nganoma iyiphi indlela obisini lwe-A1 mayelana nokuqukethwe kwe-lactose.
