Vanotsvakurudza National Institutes of Health (NIH) yakawana kuvimba kwakanyanya kwemuviri masikati ma80s. Tsvagiridzo yavo yakasimbisa kuti kushaikwa kwechiedza munguva yechando kunogona kukonzera kusagadzikana kwepfungwa. Chiedza chinovharira kuburitswa kwe melatonin, hormone yekurara, uye chinokurudzira kugadzirwa kwe serotonin, hormone inoshanda kurwisa kuora mwoyo. 

Nhasi, inopfuura 18% yevanhu veQuebec uye vanopfuura 15% yevagari veFrance vanotambura nechando blues, iyo apo zviratidzo zvinoramba zviripo, zvinogona kuva kuora mwoyo kwemwaka.

Zviratidzo zvechando blues zvinoita kuti hupenyu hwezuva nezuva huwedzere kurwadza. Kuneta, kushaya shungu, katsika kekugara wakavharika, usimbe, kusviba, kushushikana uye kufinhwa zvinowanzoitika… asi hazvigadzirike. Tsvaga mazano edu ekurwisana nemabhuru maduku echando.