4. Discussion
depression, decline in seafood consumption
In a global survey, it was reported that 10–20% of pregnant women experience postpartum depression [Of the primiparous women recruited into this study over 3.5 years (between November 2015 and April 2019), approximately 3% had a high K6 score (≥13), indicating that this population contained very few individuals with mental instability during pregnancy. The omega-3 index of maternal erythrocytes around gestational week 12 in this study was as low as in European and North American populations (>4–6%) (The possibility that EPA and DHA prevent or mitigate postpartum depression has been demonstrated previously [The Omega-6/Omega-3 ratio is treated as one of the important items for detecting the effects of PUFA [Differences in ALA metabolism [Reduced intake of omega-3 fatty acids is a global phenomenon, and Japan is no exception. In fact, there has been a marked decline in seafood consumption in Japan [