PROBLEM TO BE SOLVED: To provide a material effective for improving the activity of nerves in the brain or for preventing or remedying brain dysfunction.SOLUTION: Disclosed is an agent for activating astrocyte glucose metabolism comprising, as an active ingredient, at least one ingredient selected from the group consisting of hydrophobic solvent extracts from tien-cha, rooibos, grapes, or black tea. Also disclosed are a brain nerve cell activating agent, a brain hypofunction inhibiting agent, a brain function improving agent, and an agent for preventing or remedying brain dysfunction.SELECTED DRAWING: None【課題】脳内神経活動の向上または脳機能障害の予防もしくは改善に有効な素材の提供。【解決手段】甜茶、ルイボス、ブドウまたは紅茶の疎水性溶媒抽出物からなる群より選択される１種以上を有効成分とする、アストロサイトのグルコース代謝活性化剤、脳内神経細胞賦活化剤、脳機能低下抑制剤、脳機能向上剤、または脳機能障害の予防もしくは改善剤。【選択図】なし
