Monga tiyi yobiriwira, tiyi wakuda amapangidwa kuchokera ku masamba a chomera cha Camellia sinensis. Masamba auma ndi kuthira, omwe amapatsa tiyi mdima wandiweyani ndi kukoma kokoma kuposa tepi yobiriwira (yomwe sichimawombera).
Malingana ndi momwe imawedzeretsa mphamvu, tiyi wakuda uli ndi 50 mg ya khofi pa chikho. (Poyerekeza, tiyi ya masamba 8 mpaka 30 mg pa chikho, pamene khofi ili ndi 100 mpaka 350 mg.)
Teyi yakuda imakhala ndi antioxidants, omwe ndi mankhwala omwe amathandiza thupi kumenyana ndi mankhwala osokoneza bongo (mankhwala omwe amadziwika kuti amawononga DNA). Ma antioxidants awa akuphatikizapo quercetin, chinthu chomwe chimatetezedwa kuteteza kutupa ndi kuthandizira kuteteza thupi.
Ubwino wa Teyi Yakuda
Tawonani apa sayansi yotsatira zotsatira za thanzi lakuda:
1) Thanzi la mtima
Pakadali pano, kafufuzidwe ka zotsatira za mtima wakuda wa tiyi wapangitsa zotsatira zosiyana. Mwachitsanzo, kafukufuku wa maphunziro asanu ndi anayi omwe anafalitsidwa kale (kuphatikizapo anthu pafupifupi 195,000) anaganiza kuti kumwa makapu atatu a tiyi kapena tiyi tsiku ndi tsiku kunachepetsera chiopsezo cha 21 peresenti. Komabe, kafukufuku wa 2007 wa anthu akuluakulu 31 (a zaka zapakati pa makumi asanu ndi zisanu ndi zisanu ndi ziwiri) adapeza kuti miyezi isanu ndi umodzi ya tiyi yakuda sichimakhudza kwambiri ziwalo za mtima (monga kutupa ndi kuthamanga kwa magazi). Bungwe la National Complianceary Alternative Medicine ndi National Institutes of Health limapereka phunziroli ngati umboni wakuti tiyi wakuda sungakhudze thanzi la mtima.
2) Shuga
M'maphunziro a labotale omwe anafalitsidwa mu 2009, asayansi adapeza kuti mankhwala omwe amachokera ku tiyi wakuda amathandiza kuchepetsa kuyamwa kwa shuga wambiri kusiyana ndi zomwe zimachokera ku tiyi yobiriwira ndi tiyi ya oolong . Kuwonjezera apo, kafukufuku wokhudza kafukufuku wa anthu oposa 1,040 a 2009 adapeza kuti kudya kofiira ndi kofikira kwa nthawi yayitali kunkagwirizana ndi kuchepa kwa shuga.
3) Kupewa Kansera
Ngakhale kuti kafukufuku wina amasonyeza kuti nthawi zonse kumwa tiyi wakuda kumachepetsa chiopsezo cha khansa, ena amanena kuti palibe mankhwala omwe amapezeka ndi khansa. Kuwonjezera pamenepo, kafukufuku wina akusonyeza kuti kumwa tiyi kumakhala koopsa kwambiri komanso kumayambitsa chiopsezo cha khansa ya m'mawere komanso estrogen-receptor positive / progesterone-receptor zabwino zotupa za m'mawere.
Kumwa Tea Yamtundu wa Zaumoyo
Kusamwa kwa tiyi sikunatsimikizidwe kuteteza kapena kuchiza matenda alionse. Ngakhale kudya kwa tiyi kumapereka ubwino wathanzi, ndi bwino kufunsa dokotala kuti mudziwe kuti ndiyiti yomwe mungakhale nayo. Kwa anthu ena, kumwa kwambiri kwa caffeine kungabweretse mavuto ambiri (monga nkhawa, kuwonjezeka kwa mtima wa mtima ndi kuthamanga kwa magazi, ndi kuwonjezereka kwa zilonda zam'mimba).
> Zotsatira:
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> Chen H, Qu Z, Fu L, Dong P, Zhang X. "Ziwalo za thupi ndi antioxidant mphamvu ya 3 polysaccharides kuchokera ku tiyi wobiriwira, tiyi tiyi, ndi tiyi wakuda." J Food Sci. 2009 74 (6): C469-74.
> Goldbohm RA, Hertog MG, Mabotolo HA, van Poppel G, van den Brandt PA. "Kugwiritsira ntchito tiyi yakuda ndi ngozi ya khansa: yemwe akuyembekezera kuti azikhala pamodzi." J Natl Cancer Inst. 1996 17; 88 (2): 93-100.
> Halder A, Raychowdhury R, Ghosh A, De M. "Black tiyi (Camellia sinensis) ngati mankhwala opatsirana pogwiritsa ntchito mankhwala osokoneza bongo." J Pafupifupi Pathol Toxicol Oncol. 2005; 24 (2): 141-4.
> Larsson SC, Bergkvist L, Wolk A. "Khofi ndi tiyi wakuda kwambiri komanso chiopsezo cha khansa ya m'mawere ndi estrogen ndi progesterone receptor mu gulu la Swedish." Khansa Imayambitsa Kulamulira. 2009 12.
> Mukamal KJ, MacDermott K, Vinson JA, Oyama N, Manning WJ, Mittleman MA. "Phunziro la woyendetsa miyezi 6 la tiyi lakuda ndi matenda a mtima." Am Heart J. 2007 154 (4): 724.e1-6.
> Padziko Lonse la Mankhwala Opatsirana Ndi Omwe Amawonjezera. Kafukufuku Wowonjezera: Kumwa Teya Yakuda Sikumakhudza Zochitika pa Zoopsa za Magetsi. October 2009.
> Ma Institutes of Health. Mayi wakuda: MedlinePlus Mavitamini. August 2009.
Panagiotakos DB, Lionis C, Zeimbekis A, Gelastopoulou K, Papairakleous N, D UN, Polychronopoulos E. "Kudya kwa tiyi kwa nthawi yaitali kumagwirizanitsidwa ndi kuchepa kwa mtundu wa (mtundu wa 2) shuga pakati pa anthu achikulire ochokera kuzilumba za Mediterranean: MEDIS matenda a matenda . " Yonsei Med J. 2009 28; 50 (1): 31-8.
> Sun CL, Yuan JM, Koh WP, Yu MC. "Tiyi wobiriwira, tiyi wakuda ndi khansa yoopsa ya khansa: meta-analysis of epidemiological studies." Carcinogenesis. 2006 27 (7): 1301-9.
> Tang NP, Li H, Qiu YL, Zhou GM, Ma J. "Kugwiritsa ntchito tebulo komanso ngozi ya khansa ya m'magazi: metaanalysis." Am J Obstet Gynecol. 2009 201 (6): 605.e1-8.