The present invention, anxiety-related disorders, especially due to trauma, such as PTSD A new method for treating disorders, and food, the therapeutic or prophylactic agent of anxiety-related disorders containing n-3 highly unsaturated fatty acids contained in such as krill oil or fish oil that can be used as such as beverages and supplements as an active ingredient provide. The present invention also provides a mitigation method or forming method of preventing fear memory by adjusting the ratio of n-3 highly unsaturated fatty acids to the n-6 highly unsaturated fatty acids to be taken.本発明は、不安関連障害、特にPTSDなどの心的外傷に起因する障害の新たな処置方法、および食品、飲料やサプリメントなどとして利用可能なオキアミ油あるいは魚油などに含まれるn-3系高度不飽和脂肪酸を有効成分として含有する不安関連障害の治療剤または予防剤を提供する。更に本発明は、摂取するn-6系高度不飽和脂肪酸に対するn-3系高度不飽和脂肪酸の割合を調整することによる恐怖記憶の軽減方法または形成予防方法も提供する。
