Published research regarding the relationship between lipid levels in affective disorders has been contradictory. Additionally, most studies correlating psychosis to lipid serum concentrations only concern schizophrenic patients.

To access the relationship between serum lipid levels with the diagnosis and pathophysiology of affective disorders.

Diagnostic data (ICD–10: F31–32), including mood and psychotic features, were prospectively collected for all patients admitted at the affective disorder ward at Centro Hospitalar Psiquiátrico de Lisboa (Portugal), during the third trimester of 2016. Serum concentrations of triglycerides and total/HDL/LDL cholesterol were evaluated using standard laboratory tests. Statistical analysis was performed for possible correlations between serum lipid levels and:

– different stages of bipolar disorder (BD);

– elevated versus depressive mood (unipolar and bipolar);

– depressive mood (BD versus non-BD);

– psychotic features.

Sixty-three patients admitted were enrolled in this study: 47 presented with BD (32 manic, 10 depressives and 5 mixed episodes) and 16 presented depressive disorders. Statistical analysis (R software) revealed that depressed bipolar patients had significantly higher triglyceride (P = 0.026), total and LDL cholesterol (P = 0.525) levels than other states; mixed episodes presented higher HDL levels (P = 0.542). Although not significant, manic patients’ HDL levels were consistently elevated compared to depressive ones, whom presented with lower values overall. Finally, when adjusted for age, psychotic patients showed lower levels of total (P = 0.031) and LDL cholesterol (P = 0.052) compared to non-psychotic patients.

There is a potential link between serum lipid levels and diagnosis/psychopathology of affective disorders. Further research is needed to characterize its pathophysiologic relevance.

The authors have not supplied their declaration of competing interest.