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.本發明的目的為提供一種包括少量脂肪和油，但是明顯地顯示出濃郁味道之濃郁味道改良劑，亦即，具有高力價(titer)的濃郁味道改良劑。該改良劑的高力價可以減低要添加的脂肪和油之量以及卡路里量，且可促成將該濃郁味道改良劑用於原來含有少量脂肪和油的食物之中，例如日式清湯和黃豆湯。因此，本發明係有關一種包括長鏈高不飽和脂肪酸及/或其酯之分解物質的濃郁味道改良劑；有關一種包括長鏈高不飽和脂肪酸及/或其酯之分解物質的萃取物之濃郁味道改良劑；及有關包括該濃郁味道改良劑之食物。
