Iqembu laphesheya kososayensi laqhuba isifundo lapho afunda khona ukuncika kokulindelwe kwabantu okuvela kuguquko lwezinguquko ezingxenyeni zomzimba wazo. Kwavela ukuthi ikhono lomuntu obukhulu kancane ngokuhamba kweminyaka linomthelela ekwandeni empilweni yendlela yokuphila.
Esezinhlelweni zokufunda, ososayensi abamele i-University of Ohio Michigan University (bobabili United States) kanye ne-Institute of Demography Society Max Planck (Germany) kwenze ukuhlaziya izifo zeqembu elikhulu labantu abangaphezu kwama-4500 Abantu abadala kanye nezingane ezingaphezu kuka-3 700 ezifakiwe.
Isikhathi sesikhashana sezokwelapha sidlula isigamu sekhulu futhi sambozwa ngo-1948-2014. Ngasikhathi sinye, ukuhlaziya kwaqoka izizukulwane ezimbili ngasikhathi sinye ubudala babamele ababeneminyaka engama-31 kuye kwangama-80. Isikhombisi esikhulu sezilinganiso ngasikhathi sinye bekuyinkomba yesisindo somzimba evumela isidingo sokuhlukanisa ubukhona besikhulu sokukhuluphala ngokweqile ekuguleni okubucayi. Inhloso yalolu cwaningo bekuwukukhomba ukuxhumeka kokulindelwe kwempilo yabantu abanamandla okushintsha kwesisindo ngesikhathi. Ngenxa yalokho, umphumela wokuhlaziywa waveza ukuthi abantu baba ngakunye abantu abakhulile abadala abanesisindo esijwayelekile somzimba, kodwa abanye ngokweqile batholwa ekugugeni, kodwa bekungajwayele esigabeni sokukhuluphala.
Kuyaphawuleka ukuthi i- "Okwesibili" Ngaphansi Kwesikhathi Sokuphila Kwakhethwa Ukuphenywa yisisindo esijwayelekile kukho konke impilo yendlela yokuphila, futhi kubo, kwisikhombi esishiwoyo, babe "visa" ngokuphambuka okuncane okuzinzile okuvela ku I-BMI "ejwayelekile" ye-BMI: Ukuba nokukhuluphala ngokweqile noma okuphambene nemizimba evamile emngceleni ophansi we-Norm - okungukuthi, mncane kodwa ngaphandle kwe-pathology. Abameleli abaningana abambalwa besigaba esishiwo ngenhla sabantu baphila abantu abaqala ukuba budala ngokuba khona kwesisindo ngokweqile kepha balahlekelwe ukuguga. Ekugcineni, labo abathola izinkomba zokukhuluphala ngokweqile bebelokhu bebhekene nezinkinga ezinkulu kakhulu ngempilo ehlala njalo iminyaka engama-31 ngokuzayo ekhula kuphela. Kuyaphawulwa ukuthi, lapho ukuhlaziya, ochwepheshe babheka inani elikhulu lezinto ezihlukene ezihlanganayo ezikwazi ukuthinta isikhathi sempilo ngesimo senhlalo yemikhuba eyingozi, njll.
Ukufingqa ososayensi bakwazile lokho ngenkathi abakwazi ukuqinisa indlela yamandla anjalo. Kodwa-ke, imiphumela yokwenziwa kwesayensi ngaphandle kokuqinisekisa ukubonwa kwangaphambili kweqembu elifanayo lokucwaninga. Ikakhulu, ngo-2013, ochwepheshe bavezwa ukuthi ukuba khona kwesisindo esincane eminyakeni engaphezulu kwengxenye kungakuqinisekisa cishe ngeminyaka emibili yempilo, uma nje kungekho ukuntuleka kwezidingo zokukhuluphala. Imiphumela yocwaningo yanyatheliswa ezinhlelweni zakwamanye amazwe ezi-Annols of Epidemiology.