Association Between Dietary Fish and PUFA Intake in Midlife and Dementia in Later Life: The JPHC Saku Mental Health Study

Article type: Research Article

Authors: Nozaki, Shoko^{a; b; *} | Sawada, Norie^{c; *} | Matsuoka, Yutaka J.^d | Shikimoto, Ryo^a | Mimura, Masaru^a | Tsugane, Shoichiro^c

Affiliations: [a] Department of Neuropsychiatry, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan | [b] Department of Psychiatry, National Hospital Organization Shimofusa Psychiatric Medical Center, Midori-ku, Chiba-city, Chiba, Japan | [c] Epidemiology and Prevention Group, Center for Public Health Sciences, National Cancer Center Japan, Chuo-ku, Tokyo, Japan | [d] Division of Health Care Research, Center for Public Health Sciences, National Cancer Center Japan, Chuo-ku, Tokyo, Japan

Correspondence: [*] Correspondence to: Shoko Nozaki, MD, PhD, Department of Neuropsychiatry, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Tokyo, Japan. Tel.:+81 3 5363 3829; E-mail: shoko@jb3.so-net.ne.jp. Norie Sawada, MD, PhD, Epidemiology and Prevention Group, Center for Public Health Science, National Cancer Center Japan, 5-1-1 Tsukiji, Chuo-ku, 104-0045, Tokyo, Japan. Tel.:+81 3 3542 2511; E-mail: nsawada@ncc.go.jp.

Abstract: Background:The relationship between midlife dietary habits and risk of dementia remains unclear. Objective:To investigate the association between dietary fish and n-3 polyunsaturated fatty acid (PUFA) consumption in midlife and risk of dementia in later life. Methods:This population-based cohort study assessed food frequency (average intake in 1995 and 2000) and cognition (2014-2015) in 1,127 participants (aged 45–64 in 1995). We used logistic regression analyses to calculate odds ratios (ORs) for dementia and mild cognitive impairment (MCI) diagnoses for consumption quartiles of fish, PUFA-rich fish, total n-3 PUFAs, total n-6 PUFAs, types of PUFAs, and n-3/n-6 PUFA ratio. Estimated ORs were adjusted for age; sex; education; smoking status; alcohol consumption frequency; physical activity; histories of cancer, myocardial infarction, and diabetes mellitus; and depression. Results:Significantly reduced risks of dementia over non-dementia (MCI plus cognitively normal) were observed in the second (OR = 0.43 (95% CI = 0.20–0.93)), third (OR = 0.22 (95% CI = 0.09–0.54)), and highest quartiles (OR = 0.39 (95% CI = 0.18–0.86)) for fish; the third (OR = 0.39 (95% CI = 0.16–0.92)) and highest quartiles (OR = 0.44 (95% CI = 0.19–0.98)) for eicosapentaenoic acid (EPA); the second (OR = 0.39 (95% CI = 0.18–0.84)), third (OR = 0.30 (95% CI = 0.13–0.70)), and highest quartiles (OR = 0.28 (95% CI = 0.12–0.66)) for docosahexaenoic acid (DHA); and the third (OR = 0.36 (95% CI = 0.16–0.85)) and highest quartiles (OR = 0.42 (95% CI = 0.19–0.95)) for docosapentaenoic acid (DPA). Conclusion:High intake of fish in midlife might aid in preventing dementia.

Keywords: Cognitive dysfunction, dementia, diet, epidemiology, habits, longitudinal studies, observational study, risk factors, unsaturated fatty acids

DOI: 10.3233/JAD-191313

Journal: Journal of Alzheimer's Disease, vol. 79, no. 3, pp. 1091-1104, 2021