> The difference in life expectancy will be influenced by multiple factors and may have more to do with diet and lifestyle than with healthcare

Less than 5% of Japanese are obese (BMI >30) compared with 36% of Americans, additionally 1 in 10 Americans are severely obese (BMI>35) whereas the number in Japan is negligible.

https://theworlddata.com/us-obesity-rate-compared-to-other-c...