The purpose of the present invention is to provide a body taste improver comprising a small amount of fat and oil, but significantly showing body taste, i.e., a body taste improver with a high titer. The high titer of the improver will reduce an amount of the fat and oil to be added and calorie as well, and will enable to use the body taste improver in foods that originally contain little fat and oil, such as Japanese-style clear soup and soybean soup. Thus, the present invention is related to a body taste improver comprising decomposed substances of a long-chain highly unsaturated fatty acid and/or an ester thereof, to a body taste improver comprising an extract of decomposed substances of a long-chain highly unsaturated fatty acid and/or an ester thereof, and to a food comprising said body taste improver.