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Top 10 Healthiest Countries in the World
Global health rankings draw on dozens of metrics including life expectancy at birth, infant mortality, universal healthcare coverage, obesity prevalence, and pollution levels. Japan tops the 2026 Global Health Security Index with a life expectancy of 84.3 years, driven by a diet rich in omega-3 fatty acids, universal healthcare, and the lowest obesity rate in the OECD at just 4.5%. These ten nations have built world-class healthcare systems, cultivated health-conscious cultures, and achieved remarkable longevity outcomes that serve as blueprints for the rest of the world.
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Frequently Asked Questions About the World's Healthiest Countries
### What makes a country the healthiest in the world? Experts measure life expectancy at birth, infant mortality, universal healthcare access, obesity prevalence, air quality, and mental-health infrastructure. The countries on this list excel across nearly all of these dimensions at the same time.
### Which country ranks #1 for health in 2026? Japan ranks first with a life expectancy of 84.3 years, backed by universal healthcare coverage since 1961 and a traditional *washoku* diet low in saturated fat. Source: [WHO Global Health Observatory, 2025](https://www.who.int/data/gho).
### Why do Mediterranean countries like Spain and Italy score so highly? The Mediterranean diet — rich in olive oil, vegetables, legumes, and fish — is linked to lower rates of heart disease and diabetes. Combined with strong primary-care systems, both countries consistently achieve life expectancies above 83 years.
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