The jejunal histological appearance (hematoxylin and eosin). (A) CON, rats were orally fed with 0.5% carboxymethylcellulose sodium; (B) HS, rats were orally fed with 0.5% carboxymethylcellulose sodium and then subjected to heat treatment; (C) HS-FIS, rats were orally fed with 100 mg FIS /kg body weight/day and then subjected to heat treatment. Original magnification 100 ×, Scale bars = 100 μm.