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Effects of dietary casein content, L-tryptophan supplementation, melatonin injection and continuous darkness on the diurnal food intake pattern of male rats were investigated. The results were as follows:1) Male rats of 6 weeks of age kept under regular light-dark cycle (light from 0700 A. M. to 0700 P. M.) and served 9 or 27% casein diets took 80-90% of the 24hr. food consumption in the dark as determined at every 4hr. intervals.2) Proportion of the food consumption during the dark period or the corresponding time period of continuous darkness group to the 24hr. food consumption showed no difference between the animals fed 9 and 27% of casein diets. But, maximum food intake appeared earlier in the 27% casein diet group than the 9% group.3) The rats kept under continuous darkness for 20 days showed a diurnal food intake rhythm clearly but the proportion of the food consumption during 0700 P. M. to 0700 A. M. was lower than that of the regular light-dark cycle group. This tendency appeared to be more clear in young rats (6 weeks of age) than adult (6 months of age) ones.4) Melatonin injections (500μg/rat/day s. c.) to the rats served 9 or 27% casein diets for 20 days gave no effect on the diurnal food intake rhythm.5) The addition of 0.2% L-tryptophan to the 9 or 27% casein diets also gave no effect on the feeding pattern of rats served the diets for 20 days.
特定非営利活動法人日本栄養改善学会の論文