The possibility that the diet contents control the digestive tract motility and the feeding behavior.

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I discussed the possibility that the diet contents control thedigestive tract motility and the feeding behavior in chicks. The patterns of distribution of NPY and somatostatin, which stimulate the feeding behavior, were clarified in the chick hypothalamus. The decrease in diet protein content and the supplementation of methionine or lysine in the diet decreased the density of endocrine cells involved in the digestive tract motility. Obvious changes, however, were not recognized in the distributional pattern of NPY and somatostatin in the hypothalamus. It is suggested that the diet contents may control the motility of the digestive tract.