INS and Impaired glucose tolerance: In addition, many studies have confirmed that EGCG can improve insulin sensitivity and impaired glucose tolerance as measured by the insulin tolerance test and oral glucose tolerance test in both animal studies and human experiments (Ren, Yang, Yi, Zhang, & Yang, 2020; Torres, Cogliati, & Otton, 2019; Ueda‐Wakagi, Nagayasu, Yamashita, & Ashida, 2019; Venables, Hulston, Cox, & Jeukendrup, 2008).