The purpose of the present invention is to provide a hypoglycemic agent that can suppress the elevation of blood sugar especially due to the intake of monosaccharides such as glucose and that is useful for the prevention and treatment of diabetes and diabetes complications, as well as a health food and a food additive that are useful for the prevention and amelioration of diabetes and diabetes complications. The present invention provides a hypoglycemic agent, a health food, a feed, and a food additive that contain rice albumin as an active ingredient. Moreover, the present invention provides a method for preventing, ameliorating, or treating diabetes and diabetes complications, characterized in that rice albumin is administered or ingested.
