Guman shayi (Camellia sinensis) na iya samun amfanin lafiyar jiki wanda ya hada da hana cututtuka. Sakamakon binciken da aka ruwaito a cikin Kotun Cibiyar Kimiyya ta kasa (1999) ita ce ta farko da ta nuna cewa antioxidants da aka samu a koren shayi, wanda aka sani da polyphenols, na iya rage yadda rashin lafiya da cututtuka na arthritis .
Mice Fed Green Tea a Nazarin Hannu
Nazarin, wanda Dokta Tariq Haqqi na Jami'ar Western Western University ke yi a Cleveland, Ohio, ya yi amfani da mice don nazarin sakamakon polyphenols a cikin cututtuka na rheumatoid, maganin rheumatic da ke cike da kumburi , ciwo, kumburi, da kuma haɗin gwiwa.
An yi amfani da ƙugiyoyi a cikin binciken ko dai ruwa mai tsabta ko ruwa mai wadatar da shayi. Abubuwan da aka ba su sun kasance kamar yadda mutum yake amfani da kofuna guda hudu na kore shayi a kowace rana. Dukan ƙudawan nan an toshe su tare da collagen don manufar inducing arthritis. An yi la'akari da cututtukan da ke dauke da collagen a kamannin cututtuka na arthritis.
Sakamakon binciken ya tabbatar da cewa mice wanda aka ciyar da kayan shayi na shayi polyphenols sun kasance mai saukin kamuwa da cututtukan fuka-fuka da ke dauke da sinadarin collagen fiye da mice ba a samar da kayan shayi na shayi polyphenols ba. Daga cikin mice sun ba da shayi mai shayi wanda ya inganta ciwon wariyar launin fata, ya faru ne a farkon lokacin da aka fara. Kwanan 8 daga cikin mikiya 18 da ke shan shayi na shayi na polyphenols sun fara ciwon arthritis, yayin da kwayoyi 17 daga cikin 18 ba su karbar shayi na shayi polyphenols sun ci gaba da ciwon maganin ƙwaro.
Binciken kwayar haɗin gwiwa ta hanyar binciken jiki ta hanyar kwakwalwa ta hanyar haɓaka ƙwayoyin kullun da ke cikin mice suna karbar koren shayi da bambanci tare da ƙin ciki a cikin ƙananan ƙwayoyin ba a ciyar da shayi mai shayi ba.
Yawan shayi na shayi ya zama abin ban mamaki.
A kasashe da dama, irin su Indiya, China da Japan, shayi na shayi yana da lafiya tare da yiwuwar hana wasu cututtuka. A bayyane yake, ilimin cututtuka a cikin wadannan ƙasashe ya wanzu a wata ƙasa mai yawa fiye da sauran wurare a fadin duniya kuma wasu mutane sunyi imani da karfi a sakamakon irin shayi.
EGCG (epigallocatechin 3-gallate) shi ne polyphenol a cikin koren shayi wanda aka dauka matsayin mai aiki. A cewar rahoto a Arthritis Research & Therapy (2010), EGCG ya zama kashi 63 cikin dari na jimlar jimla. Dangane da aikin antioxidant, EGCG yana da kashi 25 zuwa 100% mafi girma fiye da bitamin C ko bitamin E. Ɗaya daga cikin kofuna na kore shayi na samar da catechins 60 zuwa 125 (ciki har da EGCG).
Hanyoyin EGCG akan Synovial Fibroblasts
Duk wadannan shekarun da suka wuce, amfanin lafiyar shayi na shayi ya kama hankalin masu bincike da sauri. An gudanar da nazarin in vitro (watau, a cikin dakin gwaje-gwaje). A shekara ta 2007, kimanin shekaru takwas bayan binciken farko, shayi na shayi ya sake yin mahimmanci. A wannan lokacin, masu bincike a Jami'ar Michigan sun gano cewa fili a shayi na shayi zai iya taimakawa hana ƙonewa da haɗuwa da haɗari a marasa lafiya na wutsiya.
A cikin wannan nazarin, ana amfani da gine-fibroblasts (cell of the joint linking). Kwayoyin sun fallasa zuwa EGCG. An ƙaddara cewa EGCG ta katange kwayoyin biyu da suke haɗuwa da raunin kashi a cikin hadadden kwakwalwa da cutar arthritis ta shafa. EGCG kuma ya katange prostaglandin E2 wadda aka saki ta bango na jini a mayar da martani ga kamuwa da cuta ko kumburi.
Prostaglandin E2 an hade da haɗin ƙoshin haɗin gwiwa.
Gwaji na Clinical na EGCG
Ana amfani da tasirin EGCG a cikin cututtukan arthritis na mutum ko osteoarthritis ta yin amfani da gwagwarmayar sarrafawa a lokaci-lokaci. Duk da yake binciken da aka samu a cikin vitro ya nuna shaida game da ayyukan anti-rheumatic na EGCG, ana buƙatar ƙarin nazari na musamman kuma ƙarshe, gwaji na gwaji wanda ya shafi marasa lafiya da haɗin gwiwa.
Sources:
Ci gaba da Cibiyar Kimiyya ta kasa, 1999; 96: 4524-4529
Green shayi ya sami sauƙin kumburi, ciwo na arthritis. NaturalNews.com. David Gutierrez. Disamba 31, 2007.
Green teat polyphenol epigallocatechin 3-gallate a arthritis: ci gaba da alkawari. Salahuddin Ahmed. Arthritis Research da Far. Afrilu 2010.