Itsinda mpuzamahanga ry'abahanga ryakoze ubushakashatsi aho yize ko yizewe no kwitegereza ubuzima bw'abantu kuva ku mpinduka z'umubiri wabo. Byaragaragaye ko ubushobozi bwumuntu bubyimba buhoro buhoro mumyaka bigira uruhare mu kwiyongera mubuzima bwinzira yubuzima.
Mubikorwa byo kwiga, abahanga bahagarariye kaminuza ya kaminuza ya Ohio Michigan (byombi) hamwe n'ikigo cya sosiyete ya demologray (Ubudage) cyakoze isesengura ry'indwara z'itsinda ry'abantu barenga 4500 Abakuze n'abana barenga 3,700 binjiye.
Igihe rusange cyigihe gito cyamakuru yubuvuzi cyarenze igice cyikinyejana gikubiyemo 1948-2014. Muri icyo gihe, isesengura ryagereranijwe ibisekuru bibiri icyarimwe nimara kuba bahagarariye bari imyaka 31 kugeza 80. Ibipimo ngenderwaho by'ingenzi kugereranya icyarimwe ni urugero rwumubiri wemerera ko ari ngombwa gutandukanya ikirego gifite umubyibuho ukabije kubera umubyibuho ukabije kubera uburwayi bukomeye. Intego yubushakashatsi bwari ukumenya isano yo guhuza ubuzima bwabantu bafite imbaraga zo guhindura ibiro mugihe. Kubera iyo mpamvu, ibisubizo by'isesengura ryerekanye ko abantu babaye igihe kirekire abantu bakuru bafite umubiri usanzwe, ariko umubyibuho ukabije wungutse ku busaza, ariko ntibyari bimenyereye igihe cy'umubyibuho ukabije.
Birashimishije kubona "isegonda" yitegereje ubuzima bwabaye iperereza nuburemere busanzwe mubuzima bwubuzima, bari "visa" batandukaniye muri "Bisanzwe" BMI: Kugira umubyibuho ukabije cyangwa urwanya imibiri isanzwe kumupaka wo hasi wibisanzwe - ni ukuvuga, kunanuka ariko nta patologiya. Benshi mu bahagarariye icyiciro cyavuzwe haruguru cy'abaturage babaga abantu batangira gukura hamwe nuburemere burenze ariko bapfuka ubusa. Hanyuma, abageze mu bipimo birenganuye bafite ibibazo by'umubyibuho umubyibuho ukabije n'ubuzima burambye bwo kubaho kumyaka 31 mugihe kizaza gusa. Twagaragaye ko, iyo gusesengura, abahanga bamenyereye umubare munini wibintu bifatika bikoreshwa neza muburyo bwo guhuza imibonano mpuzabitsina, nibindi.
Muri make abahanga mu bushakashatsi bamenyesheje ko mugihe badashobora gushishoza uburyo butera imbaraga. Ariko, ibisubizo byumurimo wa siyansi ntibihurira kwifata mbere yitsinda rimwe ryabashakashatsi. By'umwihariko, mu 2013, abahanga bahitanye ko kuba hari uburemere buke burenze mu kinyejana cya kabiri cy'igice bishobora kubyemeza mu myaka ibiri y'ubuzima, mu gihe ntaho byatangaho ibisabwa kugira ngo bibagirwe. Ibisubizo by'ubushakashatsi byasohotse mu mahanga ansles on Epodemiology.