Impikiswano ephathelene nemiphumela emihle nemibi yemisebe ye-UV empilweni yomuntu iyaqhubeka, nokho, abantu abaningi ngokwengeziwe besaba umdlavuza wesikhumba nokuguga ngaphambi kwesikhathi okubangelwa ilanga. Nokho, inkanyezi enikeza ukukhanya nokuphila kuzo zonke izinto eziphilayo idlala indima ebalulekile ekugcineni impilo, hhayi nje ngenxa kavithamini D. UC San Diego abacwaningi bacwaninga izilinganiso zesathelayithi zokukhanya kwelanga nokuba namafu ebusika ukuze balinganisele amazinga kavithamini D ku-serum ngo-177. amazwe. Ukuqoqwa kwedatha kwembule ukuhlobana phakathi kwamazinga aphansi amavithamini kanye nengozi yomdlavuza we-colorectal nowebele. Ngokusho kwabacwaningi, "Inani lokuchayeka elangeni okutholayo phakathi nosuku liyisihluthulelo sokugcina isigqi esinempilo se-circadian. Lezi zigqi zihlanganisa izinguquko ezingokomzimba, ezingokwengqondo nezokuziphatha ezenzeka phakathi nomjikelezo wamahora angu-24 futhi zisabela ekukhanyeni nasekumnyama,” kusho iNational Institute of General Medical Sciences (NIGMS). Umjikelezo wokulala nokuvuka uncike kakhulu kumthamo wasekuseni wokukhanya kwelanga. Ukukhanya kwemini okungokwemvelo kuvumela iwashi langaphakathi lebhayoloji ukuthi lishune esigabeni esisebenzayo sosuku. Yingakho kubaluleke kakhulu ukuba selangeni ekuseni, noma okungenani uvumele imisebe yelanga ekamelweni lakho. Ukukhanya kwemvelo okuncane esikuthola ekuseni, kuba nzima nakakhulu ukuthi umzimba ulale ngesikhathi esifanele. Njengoba wazi, ukuchayeka elangeni okuvamile ngokwemvelo kwandisa amazinga e-serotonin, okwenza umuntu aqaphe futhi asebenze. Ukuhlobana okuhle phakathi kwamazinga e-serotonin nokukhanya kwelanga kutholwe kumavolontiya. Kusampula yamadoda anempilo ye-101, abacwaningi bathola ukuthi ukuba khona kwe-serotonin ebuchosheni kwehle kwaba okungenani phakathi nezinyanga zasebusika, kuyilapho izinga layo eliphakeme kakhulu labonwa lapho ababambiqhaza bengaphansi kokukhanya kwelanga isikhathi eside. I-seasonal affective disorder, ebonakala ngokucindezeleka nokushintshashintsha kwemizwelo, nayo ihlotshaniswa nokuntuleka kokukhanya kwelanga. UDkt. Timo Partonen waseNyuvesi yaseHelsinki, kanye nethimba labacwaningi, bathola ukuthi amazinga egazi e-cholecalciferol, eyaziwa nangokuthi i-vitamin D3, aphansi kakhulu ebusika. Ukuchayeka elangeni ehlobo kunganikeza umzimba ngale vithamini ukuthi ihlale ebusika, okukhuthaza ukukhiqizwa kukavithamini D, okwandisa amazinga e-serotonin. Isikhumba, lapho sichayeke emisebeni ye-ultraviolet, sikhipha inhlanganisela ebizwa ngokuthi i-nitric oxide, eyehlisa umfutho wegazi. Ocwaningweni lwakamuva oluvela eNyuvesi yase-Edinburgh, odokotela besikhumba bahlole umfutho wegazi wamavolontiya angama-34 achayeke amalambu e-UV. Phakathi neseshini eyodwa, zavezwa ekukhanyeni ngemisebe ye-UV, phakathi kwesinye, imisebe ye-UV yayivinjiwe, ishiya ukukhanya nokushisa kuphela esikhumbeni. Umphumela wabonisa ukwehla okukhulu komfutho wegazi ngemva kokwelashwa kwe-UV, okungenakushiwo kwezinye izikhathi.
Isithombe sibonisa abantu abanesifo sofuba eNyakatho Yurophu, isifo esivame ukubangelwa ukuntuleka kukavithamini D. Iziguli zishiswa yilanga.