nruj me ntsis xaiv cov neeg muag khoom kom coj mus kuaj cov khoom noj-qib kev sib tsoo, tsis muaj additives thiab preservatives nyob rau hauv tag nrho cov txheej txheem, thiab tag nrho tswj tag nrho cov khoom noj khoom haus, saj thiab thawj khoom noj khoom haus ntawm cov nplej.