Tshuaj yej hnab yuav tsum tau tiv thaiv kom txhob lwj, discoloration thiab saj, uas yog hais tias, los xyuas kom meej tias cov protein, chlorophyll thiab vitamin C muaj nyob rau hauv tshuaj yej nplooj tsis oxidize.Yog li ntawd, peb xaiv cov khoom tsim nyog tshaj plaws ua ke los ntim cov tshuaj yej.