Kalmar “gero” ba ta nufin nau’in hatsi guda ɗaya ba amma ga nau’in ciyayi da yawa waɗanda ake nomawa don iri da ake ci, bisa ga bayanin. Britannica. Duk da yake gero bazai zama sananne kamar sauran hatsi ba, ya daɗe sosai. Wannan abincin sitaci yana daya daga cikin tsofaffin hatsi da ake nomawa a duniya, kuma an same shi a wuraren binciken kayan tarihi na Asiya da Afirka wadanda suka haura shekaru 7,500 a cewar kungiyar. Oldways Whole Grains Council, ƙungiyar mabukaci mai zaman kanta wacce ke aiki don haɓaka fahimtar mabukaci da cin dukan hatsi don ingantacciyar lafiya.

A yau, gero babban sinadari ne a cikin abinci na gargajiya a duk faɗin duniya, gami da komai daga porridges da breadbreads zuwa ga abin sha. Kuma saboda ba shi da alkama, ana kuma amfani da garin gero don yin kayayyakin da ba su da alkama. Hakanan ana amfani dashi sosai azaman abinci don dabbobin gida ko azaman tsuntsaye, a cewar Oldways.
Saboda gero yana da ƙarfi, kayan amfanin gona marasa kulawa waɗanda suke girma cikin sauri (kusan rabin lokacin da alkama da shinkafa suke girma) kuma suna iya bunƙasa a cikin ƙasa mara kyau, bushewar yanayi, da lokutan fari, an yi nasara a matsayin albarkatu masu mahimmanci waɗanda za su iya magance yunwa da rashin abinci mai gina jiki a sassan duniya waɗanda ke da rauni ga sauyin yanayi da ƙarancin albarkatun ƙasa, a cewar Oldways.
A 2023, da Hukumar Abinci da Aikin Gona (FAO) na Majalisar Dinkin Duniya ya sanya wa waccan shekarar "Shekarar Gero ta kasa da kasa" a matsayin wata hanya ta nuna muhimmancin gero wajen samar da abinci a duniya.
Sannan ba shakka akwai fa'idodin kiwon lafiya masu yawa da aka danganta da cin gero. “Haka ne gabaki ɗaya, don haka yana da ɗimbin hadaddun carbohydrates da fiber, kuma yana da kyau tushen furotin,” in ji John "Wesley" McWhorter, DrPH, RDN, mai magana da yawun Cibiyar Gina Jiki da Abinci na kasa, darektan magungunan salon rayuwa don Suvida Healthcare, kuma ƙwararren mai dafa abinci.
Bincike ya nuna cewa gero na iya taka rawa wajen daidaita aikin hanji, sarrafa sukarin jini da cholesterol, da kiyaye lafiyar hanji. Nazarin sun kuma nuna cewa gero na dauke da sinadarin ‘Antioxidants’ da yawa, wanda hakan ya sa ba wai kawai gidan abinci ne kadai ba amma abincin da zai iya rage hadarin kamuwa da cutar daji a jikin dan’adam.