Effect of schedule feeding on water intake and urine output in rats

Water intake of schedule feeding rats was correlated to food intake through variations in calorie content of food. On intake time restriction (3 h) schedule, it was positively correlated while on amount restriction schedule (25% and 15% food) correlation was negative. Water-to-food ratio (W/F) of 3 hFW rats was decreased whereas W/F of 25% and 15% food animals, it was increased as compared to ad lib W/F. On calorically rich (3.2 cal/gr) diet 3 hFW rats food intake (7.8 +/- 0.6 gr) and water intake (4.7 +/- 0.3 ml) remained unaltered, while ad lib rats food intake (14.7 +/- 0.9) was decreased and water intake (16.2 +/- 1.1) increased as compared to their intake on calorically poor (2.8 cal/gr) diet. Urine percent over water intake (u/w x 100) was inversely related to food intake of rats (on ad lib food, 13.8%; on 25% food 29.1% on 15% food 31.8%) excepting for urine percent of 3 hFW rats which was (7.6%) disproportionately decreased.