Perinatal depression can occur during pregnancy or up to 1 year postpartum. It is considered the most common complication during pregnancy and lactation period. Several studies have shown that essential nutrients such as folate, vitamin D, iron, selenium, zinc and fatty acids are depleted from the mother's system and this may be one of the reasons for an increased risk of depression. Thus, supplementing mother's diet with an extra portion of fruits, vegetables or prenatal vitamins may improve their mental wellbeing.
Sparling, T. M., Nesbitt, R. C., Henschke, N., & Gabrysch, S. (2017). Nutrients and perinatal depression: a systematic review. Journal of nutritional science, 6, e61. doi:10.1017/jns.2017.58