Depression and cardiovascular mortality: a role for n-3 fatty acids?
BACKGROUND
Recent studies indicate that depression plays an important role in the occurrence of cardiovascular diseases (CVDs). The underlying mechanisms are not well understood.


OBJECTIVE
We investigated whether dietary intake of the n-3 fatty acids (FAs) eicosapentaenic acid and docosahexaenoic acid could explain the relation between depressive symptoms and cardiovascular mortality.


METHODS
The Zutphen Elderly Study is a prospective cohort study conducted in the Netherlands. Depressive symptoms were measured in 1990 with the Zung Self-rating Depression Scale in 332 men aged 70-90 y and free from CVD and diabetes. Dietary factors were assessed with a cross-check dietary history method in 1990. Mortality data were collected between 1990 and 2000. Logistic and Cox regression analyses were performed, with adjustment for demographics and CVD risk factors.


RESULTS
Compared with a low intake (x: 21 mg/d), a high intake (x: 407 mg/d) of n-3 FAs was associated with fewer depressive symptoms [odds ratio: 0.46; 95% CI: 0.22, 0.95; P for trend = 0.04] at baseline and no significant reduced risk of 10-y CVD mortality [hazard ratio (HR): 0.88; 95% CI: 0.51, 1.50]. The adjusted HR for an increase in depressive symptoms with 1 SD for CVD mortality was 1.28 (95% CI: 1.03, 1.57) and did not change after additional adjustment for the intake of n-3 FAs.


CONCLUSIONS
An average intake of approximately 400 mg n-3 FA/d may reduce the risk of depression. Our results, however, do not support the hypothesis that the intake of n-3 FAs explains the relation between depression and CVD.
Kamphuis
Marjolein H
MH
Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, Netherlands. m.kamphuis@umcutrecht.nl
Geerlings
Mirjam I
MI
Tijhuis
Marja A R
MA
Kalmijn
Sandra
S
Grobbee
Diederick E
DE
Kromhout
Daan
D
D000368:Aged; D000369:Aged, 80 and over; D002318:Cardiovascular Diseases / Q000401:mortality*; D015331:Cohort Studies; D016001:Confidence Intervals; D003863:Depression / Q000150:complications / Q000453:epidemiology*; D004281:Docosahexaenoic Acids / Q000008:administration & dosage; D015118:Eicosapentaenoic Acid / Q000008:administration & dosage / Q000502:physiology; D015525:Fatty Acids, Omega-3 / Q000008:administration & dosage* / Q000502:physiology*; D005500:Follow-Up Studies; D006801:Humans; D016015:Logistic Models; D008297:Male; D009426:Netherlands; D016017:Odds Ratio; D016016:Proportional Hazards Models; D011446:Prospective Studies; D012307:Risk Factors
D015525:Fatty Acids, Omega-3; D004281:Docosahexaenoic Acids; D015118:Eicosapentaenoic Acid