Izinketho zokudla esizenzayo nsuku zonke zinemiphumela ejulile emhlabeni. Ukudla okunenqwaba yemikhiqizo yezilwane—njengenyama, ubisi namaqanda—kuphakathi kwezinto ezihamba phambili ezibangela ukucekelwa phansi kwemvelo, okunomthelela ekukhishweni kwamagesi abamba ukushisa, ukugawulwa kwamahlathi, ukuntuleka kwamanzi nokungcola. Ukulima kwemfuyo yasezimbonini kudinga inani elikhulu lomhlaba, amanzi, namandla, okuyenza ibe enye yezinhlelo ezidinga kakhulu izinsiza eMhlabeni. Ngokuphambene, ukudla okusekelwe ezitshalweni ngokuvamile kufuna izinsiza zemvelo ezimbalwa futhi kukhiqize indawo ephansi kakhulu yemvelo.
Umthelela wemvelo wokudla udlula ukuguquka kwesimo sezulu. Ukulima kakhulu kwezilwane kusheshisa ukulahleka kwezinhlobonhlobo zezinto eziphilayo ngokuguqula amahlathi, izindawo ezingamaxhaphozi nezikhotha zibe yizitshalo zokuphakelayo zokulima okukodwa, kuyilapho kungcolisa inhlabathi nemigudu yamanzi ngomanyolo, izibulala-zinambuzane, nemfucuza yezilwane. Le mikhuba ebhubhisayo ayiphazamisi nje kuphela izimiso zemvelo ezithambile kodwa futhi isongela ukulondeka kokudla ngokunciphisa ukuqina kwemithombo yemvelo edingekayo ezizukulwaneni ezizayo.
Ngokuhlola ukuhlobana phakathi kwalokho esikudlayo kanye nenani lakho lemvelo, lesi sigaba sigqamisa isidingo esiphuthumayo sokucabanga kabusha ngezinhlelo zokudla zomhlaba wonke. Igcizelela ukuthi ukushintshela emaphethini okudla okuzinzile—ukuthanda ukudla okusekelwe ezitshalweni, kwesifunda, kanye nokudla okugaywe kancane—kungawunciphisa kanjani umonakalo wemvelo kuyilapho kuthuthukisa impilo yabantu. Ekugcineni, ukushintsha ukudla akukona nje ukukhetha komuntu siqu kodwa futhi kuyisenzo esinamandla somthwalo wemfanelo wendawo.
Imboni yobisi, evame ukubonwa njengesiyingi sohlelo lokudla lomhlaba wonke, ithwala imiphumela emibi, yezemvelo kanye nezempilo okungenakwenzeka ukungayinaki. Ngaphansi komhlaba wayo kulele ukuxhashazwa kwezilwane ezikhuthazelela izimo ezicindezelayo nezinqubo eziyingozi. Imvelo, ukulima kobisi kungumshayeli omkhulu wokukhipha amagesi abamba ukushisa, ukungcoliswa kwamanzi, ukugawulwa kwamahlathi, nokukhubazeka kwezinsiza - konke kufaka phakathi ukungalingani kwemvelo. Kwabathengi, imikhiqizo yobisi ihlotshaniswa nezinkinga zezempilo ezinjenge-lactose ukungabekezelelani kanye nobungozi obukhulayo bezifo ezingamahlalakhona. Lo mbhalo usikhanyisela ngale miphumela ngenkathi uqokomisa ezinye izindlela ezisuselwa kwezitshalo ezinikeza izinketho zokuzwela kwezilwane, izinketho ezinempilo zabantu, nezixazululo ezizinzile zesikhathi esizayo seplanethi