Iyo chaiyo nzira yekugaya inogona kuitika chete mune imwe nguva yekubatanidzwa kwakakodzera kwezvigadzirwa, zvinoti mapuroteni, mafuta uye makhahydrates, panguva imwe chete. Dumbu, umo kuora kwezvokudya zvakasanganiswa zvisina kufanira kunoitika, hazvizokwanisi kupa muviri muviri nemakoriyumu nemavhitamini aivepo pakutanga mune zvekudya zvakadyiwa.
Muchinyorwa tichagara mune zvakadzama mitemo yakati wandei yekudya kwakasiyana. Chingwa, mbatatisi, pizi, bhinzi, mabhanana, misi uye mamwe makabhohaidhiretsi haakurudzirwi kudyiwa panguva imwe chete neremoni, lime, orenji, mazambiringa, chinanazi nemimwe michero ine acidic. Iyo enzyme ptyalin inoshanda chete munzvimbo ine alkaline. Michero acids haingodziviri kugayiwa kweasidhi, asiwo inosimudzira kuvirisa kwavo. Madomasi haafaniri kudyiwa nechero chikafu chine starchy. Zvidye pamwe chete nemafuta kana magidhi. Maitiro ekufananidzwa kwemakhahydrates (masitashi uye shuga) uye mapuroteni akasiyana kubva kune mumwe. Izvi zvinoreva kuti nzungu, cheese, zvigadzirwa zvemukaka hazvibvumirwi panguva imwe chete nechingwa, mbatatisi, michero inotapira, pie nezvimwe zvakadaro. Sweets (uye yakanatswa shuga kazhinji) inodzvinyirira secretion yegastric juice kusvika pamwero mukuru, zvakanyanya kunonoka kugaya. Kudya muhuwandu hwakawanda, vanodzivisa basa remudumbu. Zvikafu zviviri zveprotein zvemhando dzakasiyana (somuenzaniso, chizi nenzungu) zvinoda marudzi akasiyana egastric juice kuti atore. Inofanira kutorwa sekutonga: mune imwe kudya - imwe rudzi rweprotein. Kana uri mukaka, zvinodikanwa kushandisa chigadzirwa ichi zvakasiyana nezvimwe zvese. Mafuta anoderedza kushanda kwegastric glands, kudzivirira kugadzirwa kwegastric juice nokuda kwekudya kwemiti uye mamwe mapuroteni. Fatty acids inoderedza kuwanda kwepepsin uye hydrochloric acid mudumbu. Jelly, jamu, michero, syrups, uchi, molasses - tinodya zvose izvi zvakasiyana nechingwa, makeke, mbatatisi, zviyo, zvikasadaro zvinokonzera kuvirisa. Kupisa pie nehuchi, sezvaunonzwisisa, kubva pakuona kwekudya kwakasiyana, hazvigamuchirwi. Mamonosaccharides nema disaccharides anovirisa nekukurumidza kupfuura mapolysaccharides uye anowanzo kuvira mudumbu, achimirira kugaya kwemasitashi.
Nekutevera misimboti yakapfava yakanyorwa pamusoro, tinokwanisa kuchengetedza hutano hwemudumbu medu uye zvisikwa zvese zvakazara.