Problem to be solved: to provide a food material capable of promoting the brain secretion of the neurotrophic factor including BDNF by adding it to the food, and adding the preventive function of the cerebral nerve disease and the function of improving brain function to the food.Oligopeptide mixtures containing dipeptides or tripeptides having lysine and / or arginine as constituent amino acids can efficiently increase neurotrophic factors in the brain.
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