| abstract |
(57) [Summary] An object of the present invention is to provide a drug which is excellent in safety, can be widely used on a daily basis, and is capable of preventing and improving a decrease in immune function widely. Kind Code: A1 The present invention provides a preventive and / or ameliorating agent for reducing immune function, comprising a fructooligosaccharide containing β-2,1 (β2 → β1) -linked fructose oligomer as an active ingredient, an agent for promoting immune function persistence, and opportunistic infection. The present invention relates to a preventive and / or ameliorating agent for a disease, an agent for enhancing tumor immunity, and an agent for preventing and / or ameliorating a decrease in biological regulation function. Fructooligosaccharides containing a β-2,1 (β2 → β1) -linked fructose oligomer, which is an active ingredient of each of these drugs, can be obtained by allowing β-fructofuranosidase to act on sucrose derived from various foods. |