Japan: The authors examined whether positive affect predicted a reduction of all-cause and cause-specific mortality as well as the onset of morbidity (heart disease, stroke, hypertension, diabetes, and cancer); the search failed

Nakagawa, Takeshi, Yukiko Nishita, Chikako Tange, Makiko Tomida, Rei Otsuka, Fujiko Ando, and Hiroshi Shimokata. 2021. “Does Positive Affect Predict Mortality and Morbidity?.” PsyArXiv. June 9. doi:10.31234/osf.io/n42f6

Abstract: Positive affect contributes to health and longevity. While most research has been conducted in individualistic societies where the experience and expression of positive emotions are highly valued, evidence remains scarce in collectivistic societies that de-emphasize the importance thereof. Employing 19-year longitudinal data of Japanese adults (age range 40‒79; N = 2,033), we examined whether positive affect predicted mortality and morbidity. Health outcomes were all-cause and cause-specific mortality as well as the onset of morbidity (heart disease, stroke, hypertension, diabetes, and cancer). After adjusting for relevant covariates, the Cox proportional hazards models revealed that positive affect predicted none of the outcomes. Our results did not replicate the health−benefits of positive affect. We discussed potential reasons for the null results.