Zimatsimikiziridwa kuti anthu omwe ali ndi tsitsi lofiira amakhala ndi vitamini k, zomwe zimapangitsa kuti mabala zichiritse, chifukwa, chifukwa, magazi osauka. Ndipo kuphatikizika kwa tsitsi lofiirira - matupi awo amaphatikizika kwa vitamini D, yomwe imachepetsa kwambiri chiopsezo chokhala ndi matenda mafupa, monga anyezi ndi rickets. Anthu awa sayenera kukhala ochepera padzuwa ndipo nthawi zonse amagwiritsa ntchito zonona zoteteza: pigment dromeadanda zopumira zomwe zimakhudza khungu m'njira zomwe zimapangitsa kuti khansa yapakhungu (melanoma). Mawuwa siabwino kuti nditapatsidwa tsitsi lofiira, komanso kwa anthu a phula loyamba ndi lachiwiri (lokhala ndi khungu lowala, blondi kapena kuwala-rusia kapena maso a buluzi).
Khungu Lokha limapereka zikwangwani - yang'anani madontho anu mosamala. Gwiritsani ntchito nkhwangwa yongoganiza pa aliyense wa iwo. Igawana "zabwino" m'magawo awiri. M'madontho otetezeka, mkomberedwe ndi wosalala komanso wosalala, utoto ndi wopanda pake. Ngati mwazindikira zophatikizira zosiyanasiyana (mwachitsanzo, madontho akuda amawoneka pa molemphuka), mwina palibe chochita ndi mole. Moremania kwambiri, mwayi wake wapamwamba ubwezere ku melanoma. Kuwoneka kwa kusintha kulikonse kwapakati (kutumphuka, ming'alu, kusenda, kutulutsa magazi) kumakusangalatsani.