Ib yam li branched-chain amino acids,cov amino acids tseem ceebnqaij tau los ntawm kev noj haus. Cov amino acids tseem ceeb tuaj yeem xav txog ua lub tsev tsim cov protein uas txhawb peb cov leeg thiab cov nqaij sib txuas hauv lub cev. Cuaj cuaj cov amino acids tseem ceeb (uas suav nrog cov ceg txuas txuas leucine, isoleucine, thiab valine) yog histidine, lysine, tryptophan, phenylalanine, threonine, thiab methionine. Cov peev txheej zoo tshaj plaws ntawm cov amino acids tseem ceeb suav nrog cov tsiaj protein zoo li qe, nqaij qaib, thiab steak.
Txij li qhov tawg ntawm kev tshawb fawb nas nyob ib puag ncig xyoo 2006 uas muaj txhua tus neeg nkag mus rau lawv cov tub ze tshaj plaws ntawm cov kab sib txuas ntawm cov amino acids ntawm lub khw muag khoom ntxiv hauv zej zog, kev tshawb fawb ntxiv tsis ntev los no tau qhia tias siv tag nrho cuaj qhov tseem ceeb amino acids muaj txiaj ntsig zoo rau kev txhawb nqa protein protein synthesis raws li kev tawm tsam kom siv peb lub branched-chains hauv kev sib cais. Xav tias nkag siab qhov no ua rau muaj kev nkag siab zoo, raws li ua tiav qhov kev tsim cov nqaij protein tshiab nws zoo li yuav tias txhua cov amino acids xav tau nyob tam sim no, tsis yog xaiv ob peb yam ua nws tus kheej (nco ntsoov cov nqaij protein tshiab xav tau kom muaj tag nrho. cov amino acids tseem ceeb).
Cov amino acids tseem ceeb kuj tau pom hauv kev tshawb fawb txhawm rau txo cov nqaij ntshiv poob/poob, txhim kho cov leeg kev loj hlob thiab txhawb kev zom zaub mov. Cov kev tshawb fawb tseem qhia tias kev siv cov amino acids tseem ceeb nyob ze rau koj qhov kev tawm dag zog tuaj yeem ua kom nrawm cov txheej txheem rov qab nqaij.