A 2009 research study showed that there is a correlation between perinatal depression and low levels of certain key nutrients. The study showed that there are links between low levels of folate, vitamin B12, calcium, iron, selenium, and zinc, and mood in general. Post-Pregnancy-Depression can be attributed to the depletion of those key nutrients.

“Perinatal depression: prevalence, risks, and the nutrition link–a review of the literature,” Leung BM, Kaplan BJ, et al, J Am Diet Assoc, 2009; 109(9): 1566-75.