The dilution effects of healthy lifestyles on the risk of depressive symptoms attributed to life-course disadvantages among Chinese middle-aged and older adults

Life-course disadvantages and unhealthy lifestyles are well-known to independently induce depressive symptoms, but whether adopting healthy lifestyles can dilute the depressive risks attributed to life-course disadvantages remain unknown in China.This population-based cross-sectional study included 5724 middle-aged and older people from the China Health and Retirement Longitudinal Study (CHARLS). Depressive symptoms and healthy lifestyles (including regular exercise, reasonable sleep, never smoking, and no heavy alcohol consumption) were collected in 2018 while life-course disadvantages were collected in 2014.Multiple healthy lifestyles were associated with decreased depressive risks more significantly as the life-course disadvantages increased, with odds ratios (ORs) and 95 % confidence intervals (CIs) of 0.44 (0.25-0.80) and 0.33 (0.21-0.53) for 4 healthy lifestyles in participants with mild and severe life-course disadvantages, respectively. Life-course disadvantages and unhealthy lifestyles had enormous joint effects on depressive symptoms. Finally, adopting multiple healthy lifestyles can dilute the depressive risks attributed to life-course disadvantages and even mask some risks attributed to childhood disadvantages.Given that dietary data were not gathered by the CHARLS, diet was not included in this study. In addition, information on life-course disadvantages was primarily self-reported, which may lead to potential recall bias. Finally, the cross-sectional design of this study cannot capture causal associations well.Adopting multiple healthy lifestyles can well-dilute the depressive risks attributed to life-course disadvantages in middle-aged and older Chinese, which is of great importance for reducing the depressive burden and the construction of healthy aging in China.