a1 Department of Healthcare Administration, Asia University, 500 Liufeng Road, Wufeng, Taichung 41354, Taiwan, Republic of China
a2 Department of Health Services Management, School of Public Health, China Medical University, Taichung, Taiwan, Republic of China
a3 Nursing Department, Hsin Yung Ho Hospital, Taoyuan, Taiwan, Republic of China
Objective The study evaluated the association between consumption frequencies of the major food categories and the risk of new depression four years later in older Taiwanese.
Design A prospective cohort study with multistage random sampling. Logistic regression analysis evaluated the significance of the longitudinal associations of intake frequencies of the major food categories with future (4 years later) risk of new depression, controlled for possible confounding factors with or without adjustment for cognitive status.
Setting Population-based free-living elderly.
Subjects Men and women (n 1609) ≥65 years of age.
Results In a regression model that controlled for demographic, socio-economic, lifestyle and disease/health-related variables but not cognitive status, both fruits (OR = 0·66, 95 % CI 0·45, 0·98, P = 0·038) and vegetables (OR = 0·38, 95 % CI 0·17, 0·86, P = 0·021) were protective against depressive symptoms 4 years later. However, when the same regression model was also adjusted for cognitive status, only vegetables (OR = 0·40, 95 % CI 0·17, 0·95, P = 0·039) were protective against depressive symptoms. Higher consumption of eggs was close to being significant in both regression models (P = 0·087 and 0·069, respectively). Other food categories including meat/poultry, fish, seafood, dairy, legumes, grains and tea showed no significant associations.
Conclusions Results suggest that although confounding factors cannot be totally ruled out, more frequent consumption of vegetables seems to be protective against depressive symptoms in the elderly. Further studies are needed to elucidate the causal role and the mechanism of the association.
(Received May 30 2011)
(Accepted October 11 2011)
(Online publication December 16 2011)