Provided are: a calorie-reducing composition including a cyclic dipeptide or a salt thereof； and a food or beverage including said calorie-reducing composition. The cyclic dipeptide included in this calorie-reducing composition is efficiently absorbed by living organisms, and is excreted mainly as an unaltered substance or a conjugate of water-soluble molecules such as glucuronic acid, without breaking down into free amino acids. Accordingly, this calorie-reducing composition is useful for dieting, reducing calories, and preventing and/or ameliorating metabolic syndrome.本發明係有關一種含有環狀雙胜肽或其鹽之降低卡路里用組成物，以及含有該降低卡路里用組成物而成之飲食品。本發明之降低卡路里用組成物，其所含有之環狀雙胜肽在生體內可有效率地被吸收，由於並不會被分解為游離胺基酸，主要是以未變化體或以葡萄糖醛酸等水溶性分子的接合體形式直接被排出體外，可有效利用於例如節食、降低卡路里用、或是預防以及/或改善代謝症候群。
