“Notably, the relative weight of duodenum, jejunum and ileum, … depth ratio, the jejunal activities of glutathione peroxidase, total antioxidant capacity, catalase and total …/or quadratically by L-theanine (P<0.05), while crypt depth, serum D-lactic acid, and … contents were decreased linearly and/or quadratically (P<0.05).”