Coffee consumption and psychological wellbeing among Japanese auto factory workers

BACKGROUND: Health habits are sometimes closely related to physical and mental health status. OBJECTIVE: The relationship between coffee consumption and psychological wellbeing was evaluated by considering confounding factors. METHODS: A total of 5,256 men, aged 35 to 60 years, from a workplace in Japan participated in this study conducted in 2018. Psychological wellbeing was evaluated using the General Health Questionnaire (GHQ) 12-item version and multivariate logistic regression analysis was used for the analysis. RESULTS: Positive GHQ12 score was significantly associated with average daily sleeping time < 4 h, lack of regular exercise and younger age. In contrast, there was no significant association between positive GHQ12 score and coffee consumption. Coffee consumption and smoking status was not significantly related to psychological wellbeing as measured using the GHQ questionnaire. In contrast, aging, regular exercise and sleeping time were related to psychological wellbeing. CONCLUSION: Coffee consumption was not significantly related to psychological wellbeing, and casual association might be confirmed by a prospective study.