I love a Walter Willett study. But this one is bittersweet for me. A victory for omega-3s. Another strike against excess omega-6s. But no noted benefits from fish, one of my top brain foods?! That is hard to digest.
|Authors||M. Lucas, F. Mirzaei, E.J. O’Reilly, A. Pan, W.C. Willett, I. Kawachi, K. Koenen, A. Ascherio|
|Institution||Harvard School of Public Health|
|Publication Name||The American Journal of Clinical Nutrition|
|Publication Date||June 2011|
Background: The associations between different sources of dietary n-3 (omega-3) and n-6 (omega-6) fatty acids and the risk of depression have not been prospectively studied.
Objective: The objective was to examine the relation between different n-3 and n-6 types with clinical depression incidence.
Design: We prospectively studied 54,632 US women from the Nurses’ Health Study who were 50-77 y of age and free from depressive symptoms at baseline. Information on diet was obtained from validated food-frequency questionnaires. Clinical depression was defined as reporting both physician-diagnosed depression and regular antidepressant medication use.
Results: During 10 y of follow-up (1996-2006), 2823 incident cases of depression were documented. Intake of long-chain n-3 fatty acids from fish was not associated with depression risk [relative risk (RR) for 0.3-g/d increment: 0.99; 95% CI: 0.88, 1.10], whereas α-linolenic acid (ALA) intake was inversely associated with depression risk (multivariate RR for 0.5-g/d increment: 0.82; 95% CI: 0.71, 0.94). The inverse association between ALA and depression was stronger in women with low linoleic acid (LA) intake (P for interaction = 0.02): a 0.5-g/d increment in ALA was inversely associated with depression in the first, second, and third LA quintiles [RR (95% CI): 0.57 (0.37, 0.87), 0.62 (0.41, 0.93), and 0.68 (0.47, 0.96), respectively] but not in the fourth and fifth quintiles.
Conclusions: The results of this large longitudinal study do not support a protective effect of long-chain n-3 from fish on depression risk. Although these data support the hypothesis that higher ALA and lower LA intakes reduce depression risk, this relation warrants further investigation.