The Intervention of L-Theanine on Behavior Changes Induced by High Protein Diet in Rats SONG Yuxin, ZHANG Jiao, HE Lin, LI Lanlan, CHEN Meiyan, ZHANG Yangling, QU Qingyun,  XIAO Wenjun* （ Key Lab of Tea Science of Ministry of Education, Hunan Agricultural University, Hunan Agricultural  University, National Research Center of Engineering Technology for Utilization of Botanical Functional  Ingredients, Changsha, 410128, China）