ʻO nā huaora, i kekahi manawa i unuhi ʻia e like me nā huaora, he huaʻōlelo kikoʻī i ka meaʻai. Hōʻike lākou i kahi pūʻulu o nā mea hoʻohuihui a he ʻano o nā mea kūlohelohe e pono ai nā kānaka a me nā holoholona e mālama i nā hana physiological maʻamau. ʻAʻole hiki ke hana ʻia ka hapa nui e ke kino ponoʻī a pono e loaʻa mai ka meaʻai. He liʻiliʻi wale nō ka mea hiki ke hoʻohui ʻia i loko o ke kino a i hana ʻia e nā microorganisms intestinal. He kuleana koʻikoʻi lākou i ka ulu ʻana o ke kanaka, ka metabolism, a me ka hoʻomohala ʻana a ʻo ia kekahi o nā meaʻai nui ʻeono (carbohydrates, momona, protein, minerala, vitamina, a me ka wai). ʻAʻole komo nā huaora i ka hoʻokumu ʻana i nā cell kanaka a hāʻawi i ka ikehu no ke kino, akā komo lākou i nā hopena biochemical i ke kino a hoʻoponopono i nā hana metabolic o ke kino. Inā lawa ʻole ka ʻai ʻana o ka huaora, e alakaʻi ia i kahi imbalance i ka metabolism kanaka, e hoʻemi ana i ka pale ʻana a me ka "kaʻi ʻole o ka vitamina." Hiki ke kumu no ka nele o ka huaora mua ma muli o ka nele o ka huaora i ka meaʻai a i ʻole ka hoʻemi ʻana i ka ʻai.
Hiki ke kumu o ka nele i ka huaora lua ma muli o ka emi ʻana o ka hiki o ke kino ke komo i nā huaora, ka nui o ka pono no nā huaora, a i ʻole ke keakea ʻana mai kekahi mau lāʻau lapaʻau. He ʻohana nui nā huaora, me nā kakini i ʻike ʻia i kēia manawa. Hiki iā lākou ke hoʻokaʻawale ʻia i ʻelua ʻano nui: ka momona -soluble a me ka wai-soluble. Hiki ke hoʻoheheʻe ʻia i ka wai-huaola hiki ke hoʻoheheʻe ʻia i loko o ka wai akā ʻaʻole i loko o-polar organic solvents. Ma hope o ka ʻai ʻana, liʻiliʻi loa ka mālama ʻana i loko o ke kino, me ka nui e hoʻokuʻu ʻia i loko o ka mimi. Hiki ke hiki ke ho Hiki iā lākou ke komo i ke kino me nā momona a hōʻiliʻili i loko o ke kino, me ka haʻahaʻa haʻahaʻa. Loaʻa i kēlā me kēia huaora nā hopena he nui, no laila he nui nā hana o ka hapa nui o nā huaora. ʻO nā huaora A, D, E, a me K he mau huaola hiki ke hoʻoheheʻe ʻia i ka momona, a ʻo nā huaora B a me C he mau huaola hiki ke hoʻoheheʻe ʻia i ka wai. Ua like like kekahi mau mea me kekahi mau huaora a hiki ke hoʻololi ʻia i mau huaora ma o nā hopena metabolic maʻalahi. Ua kapa ʻia kēia mau mea he provitamins. No ka laʻana, hiki ke hoʻololi ʻia ka carotene i huaora A; Hiki ke hoʻololi ʻia ka 7-dehydrocholesterol i ka vitamina D3, akā pono kēia i nā hopena metabolic paʻakikī. ʻAʻole hiki ke manaʻo ʻia he provitamin ʻo Tryptophan, kahi ʻāpana o ka waikawa nicotinic.