Abstract: An object of the present invention is to provide a novel pharmaceutical agent for improving autism spectrum disorder, a pharmaceutical agent for improving a mental disease, or a supplement exerting an effect of improving social behaviors or developing sociality or an anti-anxiety and anti-stress effect or a functional food exerting such an effect. The present invention also provides a pharmaceutical agent for promoting the secretion of oxytocin and/or vasopressin in the brain. The above objects are achieved by a pharmaceutical agent for improving autism spectrum disorder, a pharmaceutical agent for improving a mental disease, or a supplement exerting an effect of improving social behaviors or developing sociality or an anti-anxiety and anti-stress effect or a functional food exerting such an effect, or a pharmaceutical agent for promoting the secretion of oxytocin and/or vasopressin, which comprises D-allulose as an active ingredient.

Abstract: An object of the present invention is to provide a novel pharmaceutical agent for improving autism spectrum disorder, a pharmaceutical agent for improving a mental disease, or a supplement exerting an effect of improving social behaviors or developing sociality or an anti-anxiety and anti-stress effect or a functional food exerting such an effect. The present invention also provides a pharmaceutical agent for promoting the secretion of oxytocin and/or vasopressin in the brain. The above objects are achieved by a pharmaceutical agent for improving autism spectrum disorder, a pharmaceutical agent for improving a mental disease, or a supplement exerting an effect of improving social behaviors or developing sociality or an anti-anxiety and anti-stress effect or a functional food exerting such an effect, or a pharmaceutical agent for promoting the secretion of oxytocin and/or vasopressin, which comprises D-allulose as an active ingredient.

Abstract: An object of the present invention is to provide a GLP-1 secretagogue which is an incretin hormone-related drug relatively inexpensive, excellent in safety, and capable of promoting GLP-1 secretion without containing sucrose as an essential constituent. The object is achieved by a GLP-1 secretagogue characterized by containing D-psicose as an active ingredient.

Abstract: Object: To provide an agent for sustaining satiety or a method for sustaining satiety, with which an individual's food intake is reduced by sustaining satiety, and as a result, pathological conditions such as obesity due to overeating can be prevented and improved. Means for Resolution: An agent for sustaining satiety containing D-psicose as an active ingredient and a method for sustaining satiety by the ingestion of D-psicose. Advantageous Effect: Satiety can be sustained although the increase in blood glucose level after eating is suppressed. A means for sustaining satiety which is useful for those who are anxious about their blood glucose level and those who are health conscious can be provided.