<;P>;PROBLEM TO BE SOLVED: To provide a food composition containing as an effective component a substance which specifically block a reaction path which is activated by SPC, a causative substance of blood vessel contraction, and having a preventive effect on various diseases caused by blood vessel contraction, in regard to the prevention of various diseases caused by blood vessel contraction. <;P>;SOLUTION: This food composition having a preventive effect on diseases caused by blood contraction contains EPA, which is a kind of unsaturated fatty acid contained in fish etc. , as an effective component and utilizes its property to specifically block a set of reaction paths of blood vessel contraction which occurs by SPC's stimulus. Various auxiliary components are used to effectively take in the above-mentioned components into the body. <;P>;COPYRIGHT: (C)2007,JPO&INPIT