Trait Emotional Intelligence (trait EI) is a constellation of correlated emotion-related traits that capture an individual's typical way of processing emotion-related information and reacting in emotional situations. Numerous studies have shown that trait EI is a significant predictor of both subjective and objective health. This correlational meta-analysis (k = 106, N = 45,262) aims to explore the behavioural and biological variables that could account for these effects. It also aims to provide a roadmap for future research by identifying what should be studied (pinpointing dead-end roads and promising paths) and how (methodological improvements needed to draw stronger conclusions). The results revealed large associations of trait EI with social support, sleep quality, and hypothalamic-pituitary-adrenal axis activity in challenging situations as well as medium associations with dietary habits, physical activity, and substance use. Other candidate pathways have given rise to much less research. Based on both theoretical predictions and preliminary findings, the paper categorises these pathways as promising or not promising. Future research would benefit from using more diverse samples, measuring behavioural variables more objectively, controlling for personality, and systematically examining to what extent changes in EI (e.g., following training) lead to changes in behaviours and/or biological parameters.
Keywords: Emotional competence; behaviours; disease; illness; physiology.