The odds ratios of metabolite on lifetime MDD status given by the inverse variance weighted MR method, coloured by metabolite group. Significant MR findings (PFDR < 0.05) are filled in and labelled. DHA; Docosahexaenoic Acid, Unsaturation; Degree of Unsaturation, Omega_3_pct; Omega-3 to Total Fatty Acids (%), Omega-3; Omega-3 Fatty Acids, Omega_6_by_Omega_3; Omega-6: Omega-3 Ratio.