Periodic-acid Schiff (PAS) stained histological sections of livers of rats exposed to a restricted feeding schedule for 3 weeks (food intake from 12:00 to 14:00 h). Pink color indicates the presence of hepatic glycogen. Tissue samples from food-restricted and ad-libitum fed rats were collected before (08:00 h), during (11:00 h), and after food anticipatory activity (14:00 h). The control group with 24-h fasting was processed at 11:00 h. Panels A, C, and E, control ad-libitum fed groups; panels B, D, and F, food-restricted groups; panel G, 24-h fasted group. Images in panels A and B were taken at 08:00 h, in panels C, D and G at 11:00 h, and E and F at 14:00 h.