Kofi na da mashahuri wajen kara fahimta a safiya, amma wani gwaji na placebo a Japan ya nuna cewa shayin matcha na iya ba da ƙarin fa'ida. Shan matcha na yau da kullum ya ƙara yawan aikin da mutane suka kammala a wani gwajin lissafi da ke haifar da damuwa, yayin da shan kofi ya ƙara ƙwarewa ne kawai a gwaji guda. Binciken yana da wasu iyakoki, kamar ƙananan yanayin damuwa, ɗaukar mahalarta kaɗai ɗaya, da rashin tantance adadin L‑theanine a farkon gwajin, don haka sakamakon na buƙatar a yi la’akari da su.
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