A composition comprising (a) and (b), and a food or drink or a medicine comprising the composition, wherein(a) is at least a kind of polyphenols selected from the group consisting of a polyphenol containing 15 mass % or more of proanthocyanidin having a polymerization degree of 1 to 3, hesperidin, a hesperidin derivative, and hesperetin； and(b) is at least a kind of xanthine derivatives,the mass ratio of (a):(b) in the composition being 1:(0.001 to 5), are useful for the prevention, amelioration, or treatment of metabolic syndrome, disorders of lipid metabolism (for example, fatty liver, hyperlipidemia), obesity (for example, visceral fat accumulation, subcutaneous fat accumulation), or the like.
