Japanese study shows overweight people live longest

June 18, 2009 The Yomiuri Shimbun

Good news at last for chubby people having a few love handles may help a person live longer, a recent study showed.

People who are overweight at the age of 40 live longer on average than people with other physiques, according to the study conducted by a Japanese Health, Labor and Welfare Ministry research team.

The large-scale study also shows that thin people have the shortest life expectancy, on average dying six or seven years earlier than overweight people.

This remarkable result could ring alarm bells for people overeager to tighten their belts by a few notches and avoid being labeled "metabo," a Japanese term used to describe people with .

As part of the study, which was organized by Ichiro Tsuji, a professor at Tohoku University, the team of researchers studied such matters as the health of about 50,000 residents of Miyagi Prefecture age 40 or more over a 12-year period.

The researchers looked at the past physiques of the participants and analyzed the ages they lived to from the age of 40 and grouped them into classifications of body mass index (BMI), an indicator of how fat a person is.

The results showed that men of regular weight (with a BMI of between 18.5 and 25) at age 40 live for an additional average of 39.94 years, while those who are overweight (BMI of between 25 and 30) at age 40 live for a further 41.64 years. Women of regular weight live on average for a further 47.97 years, compared with _who live another 48.05 years, according to the study.

Obese men and women (BMI of 30 or more) live a further 39.41 and 46.02 years, respectively. But thin men (BMI of less than 18.5) are on average expected to live 34.54 more years, and thin women another 41.79 years, the study showed.

Possible explanations as to why thin people could die earlier include the fact that many thin people smoke and a theory that underweight people are more susceptible to contagious diseases.

However, the link between physique and life expectancy is not clearly understood. Shinichi Kuriyama, an associate professor at Tohoku University who led the actual research, warns that "people won't extend their lives by straining to put weight on."

But the study also found that the fatter a person is, the greater their medical expenses.

The average lifetime medical expenses for obese people from the age of 40 is 15.21 million yen ($158,000) for men and 18.6 million yen ($193,000) for women _ both 30 percent higher than for thin people.


(c) 2009, The Yomiuri Shimbun.

Visit the Daily Yomiuri Online at www.yomiuri.co.jp/index-e.htm/

Distributed by McClatchy-Tribune Information Services.

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5 / 5 (1) Jun 18, 2009
People have different body types, different fat distribution patterns based on hereditary factors as well as gender. As people age, metabolism slows, other functions slow and as is noted in mammals otherwise, weight gain appears to serve a protective function against bone loss and against a wasting disease process as well as some forms of illness/injury the aging might otherwise prove to be susceptible to without it.

Its a little alarming to see the 'all good' 'all bad' approach to research regarding weight gain, BMI, etc., particular for people in middle life and beyond. A natural evolution of aging may show that nature is wise after all in this regard. This doesn't mean that eating 10 twinkies a day is justifiable but just perhaps that extra 10-20 pounds as one ages with a healthy life style otherwise isn't the all evil and primary source towards disease and illnesses either. It may well prove to be natural and healthy for that age group. Just as babies have 'baby fat' our fat, metabolism and the functions of fat in our body changes during the course of our lifetimes. It would be unwise to categorize all fat as a hazard during all life's phases. More study is required with a broader view accounting for human life spans complete with hormonal and other changes during those life spans.

Perhaps understanding the role of fat in infants and children and how this progresses during developmental phases may provide some clues to the roles of fat, hormones and metabolism in older ages.

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