Nri bụ ihe ọ bụla a na-eri iji nye nkwado na-edozi ahụ maka ihe dị ndụ. Nri na-abụkarị nke osisi, anụmanụ, ma ọ bụ fungal, ma nwee ihe oriri dị mkpa, dị ka carbohydrates, abụba, protein, vitamin, ma ọ dị ka mineral. Ihe dị ndụ na-eri ihe ahụ ma mkpụrụ ndụ nke ihe ahụ na-eri ya iji nye ike, mee ka ndụ dịgide, ma ọ bụ kpalie uto. Ụdị anụmanụ dị iche iche nwere omume iri nri dị iche iche nke na-egbo mkpa nke metabolism ha pụrụ iche, na-agbanwekarị iji mejupụta otu niche gburugburu ebe obibi n'ime ọnọdụ ala ụfọdụ.

Ụmụ mmadụ na-eri ihe niile na-eme mgbanwe nke ukwuu ma nwee ike inweta nri n'ọtụtụ usoro okike dị iche iche. Ihe ka ukwuu n'ike nri achọrọ bụ ụlọ ọrụ nri, nke na-emepụta nri na ọrụ ugbo siri ike ma na-ekesa ya site na nhazi nri dị mgbagwoju anya na usoro nkesa nri. Usoro ọrụ ugbo a na-adabere n'ụzọ dị ukwuu na mmanụ ala, nke pụtara na usoro nri na ọrụ ugbo bụ otu n'ime ndị isi na-enye aka na mgbanwe ihu igwe, na-aza ajụjụ maka ihe ruru 37% nke ngụkọta gas na-ekpo ọkụ.^[1]

Usoro nri nwere mmetụta dị ukwuu n'ọtụtụ nsogbu mmekọrịta ọha na eze na ndọrọ ndọrọ ọchịchị ndị ọzọ gụnyere: nkwado, ụdị dị iche iche nke ndu, akụnụba, ụba mmadụ, inye mmiri na nchekwa nri. Ndị ụlọ ọrụ mba ụwa na-ahụ maka nchekwa na nchekwa nri dị ka International Association for Food Protection, World Resources Institute, World Food Programme, Food and Agriculture Organisation, na International Food Information Council.

1. ↑ SAPEA (2020). A sustainable food system for the European Union. Berlin: Science Advice for Policy by European Academies. DOI:10.26356/sustainablefood. ISBN 978-3-9820301-7-3. Retrieved on 14 April 2020.