Purpose: China has faced rapid growth of its older adult population, shifting dietary landscape, and sleep-related problems. However, knowledge regarding the associations of dietary behavior on sleep-related outcomes with longitudinal data remains limited. This study investigates the relationships of dietary habits with sleep quality and duration.
Methods: Using data from the Chinese Longitudinal Health Longevity Survey (CLHLS), older adults were included in the 9-year span between 2005 and 2014 (age ≥ 60; n = 62,552). Self-reported dietary habits, sleep quality, and sleep duration (hours) were assessed. Four types of dietary behaviors were identified: vegetables, fruits, egg, and meat. Cox proportional hazard models were used to explore the potential association between dietary habits and sleep status. The outcomes were self-reported sleep quality and sufficient sleep duration (7-8 h daily).
Results: In the study sample, the median age was 87 years old, and approximately 57.2% of the study participants were female. More than 60% of the older adult population had good quality sleep, and almost 40% of participants slept 7-8 h a day. In the fully adjusted Cox models, daily fruits, meat, and egg consumption were positively associated with sleep quality (all p < 0.05). Compared with participants who rarely consumed or did not consume vegetables, more frequent consumption was positively associated with sufficient sleep duration (all p < 0.0001) but was not associated with sleep quality.
Conclusion: Older adults should be aware that sleep quality and duration might be related to their dietary habits.
Keywords: China; Diet; Older adult; Sleep hours; Sleep quality.