Lifestyle Practices and Longevity: Lessons from Japanese Health Philosophy for Sustainable Well-Being

Abstract Japan’s high longevity has motivated global interest in lifestyle patterns associated with healthy aging. This narrative review synthesizes ScienceDirect-indexed evidence on key elements often described as “Japanese health philosophy,” including purpose in life (ikigai), mindful eating and dietary patterns (including Okinawan-style, plant-forward, soy-rich diets), routine physical activity, social connectedness, sleep regularity, and restorative practices such as bathing. Cohort studies in Japan link ikigai with lower mortality risk and better later-life well-being, suggesting that meaning and purpose may be protective psychological resources. Dietary evidence shows that adherence to Japanese dietary patterns is associated with lower mortality risk and longer survival time, while specific components such as green tea intake are associated with reduced all-cause and major-cause mortality in Japanese cohorts. Lifestyle activity evidence indicates that physical activity is protective for all-cause and cardiovascular mortality among Japanese older adults, whereas prolonged sedentary behavior is associated with higher mortality risk. Social connectedness and participation shape supportive networks and may reduce risks associated with social isolation; sleep regularity also emerges as an independent factor linked to mortality. Overall, evidence supports a “systems view”: sustainable well-being is most plausibly achieved through mutually reinforcing practices—diet quality, movement, meaning, and social connection—rather than any single “longevity secret.” Keywords: longevity; Japan; Okinawa; ikigai; Japanese diet; green tea; physical activity; social participation; sleep regularity; sustainable well-being.