• Kyodo News

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The life expectancy of overweight people at the age of 40 is around six years longer than for those who are slim at the same age, according to a study by a group of researchers at Tohoku University released Saturday.

The group surveyed 44,000 people aged 40 to 79 in Miyagi Prefecture from 1995 to 2006, categorizing them into four groups based on body-mass index, or BMI — skinny at a BMI below 18.5, normal above 18.5 and below 25.0, overweight above 25.0 and below 30.0, and obese above 30.0.

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