In April 2019 researchers from Iran published their review of the medical scientific literature to assess the association between the Mediterranean diet and risk of depression. A total of 14 studies involving 56,043 individuals were included in the review. Results showed that adherence to the Mediterranean diet did not appear to influence the risk of depression.
Shafiei F et al. Adherence to the Mediterranean diet and risk of depression: a systematic review and updated meta-analysis of observational studies. Nutr Rev. 2019 Apr 1;77(4):230-239