Maza suna buƙatar shan koren shayi akai-akai. Masana kimiyya sun gano sinadarin L-theanine a cikin abin sha, wanda ke aiki a kan kwakwalwar maza kuma yana kara karfin tunani da yanke shawara. Kafin binciken ya kasance wani gwaji da masu sa kai 44 suka shiga.
Da farko, an tambayi masu amsa su sha koren shayi. Kuma bayan haka, bayan kimanin awa daya, mun gwada su. A sakamakon haka, hoton ya kasance kamar haka: 'yan agajin da suka sha shayi kafin gwajin sun fi kyau da gwaje-gwaje. Ƙwaƙwalwarsu ta yi aiki sosai fiye da waɗanda ba su sha shayi ba.
Abin sha, likitoci sun ce, ya ƙunshi polyphenols da yawa. Amfani da su yana da amfani ga kiba, ciwon sukari, atherosclerosis, cututtukan hanji. Amma saboda wane dalili waɗannan abubuwan sun fi shafar maza, har yanzu ba a bayyana ga masana kimiyya ba.