Disclosed is a composition or beverage/food for inhibiting the fat absorption, which is derived from a natural material and therefore is safe, and which can be ingested continuously. The composition or beverage/food comprises the following components: (A) theaflavine monogallate; (B) theaflavine; (C) theaflavine digallate; and (D) polyphenol, wherein these components satisfy the following requirements: (1) a weight-based content ratio [(A)/(B)] is 0.4-100%; (2) the weight of the component (A) is larger that that of the component (C); and (3) a weight-based content ratio [A)/(D)] is 0.01-1.0%. The composition or beverage/food can be used for the prevention or treatment of a disease such as arteriosclerosis and an ischemic heart disease (e.g., angina pectoris, myocardial infarction).