According to this –
Chubby people live longest: Japan study
People who are a little overweight at age 40 live six to seven years longer than very thin people, whose average life expectancy was shorter by some five years than that of obese people, the study found.
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The study divided people into four weight classes at age 40 according to their body mass index, or BMI, calculated by dividing a person's weight in kilograms by their squared height in metres.
The normal range is 18.5 to 25, with thinness defined as under 18.5. A BMI of 25 to 30 was classed as slightly overweight and an index above 30 as obese.
To calculate your own BMI, go here – Calculate your BMI – Standard BMI Calculator
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