Residents of Amagasaki danced to the city's anti-overweight song, which warned against trouser buttons popping and flying away, "pyun-pyun-pyun," and urged prompt checkups. (Ko Sasaki for The New York Times)

Japan, seeking trimmer citizens, decides to measure millions of waistlines

AMAGASAKI, Japan: Japan, a country not known for its overweight people, has undertaken one of the most ambitious campaigns ever by a nation to slim down its citizenry.

Summoned by the city of Amagasaki one recent morning, Minoru Nogiri, 45, a flower shop owner, found himself lining up to have his waistline measured. With no visible paunch, he seemed to run little risk of being classified as overweight, or metabo, the preferred word in Japan these days.

But because the new state-prescribed limit for male waistlines is a strict 33.5 inches, he had anxiously measured himself at home a couple of days earlier. "I'm on the border," he said.

Under a national law that came into effect two months ago, companies and local governments must now measure the waistlines of Japanese people between the ages of 40 and 74 as part of their annual checkups. That represents more than 56 million waistlines, or about 44 percent of the entire population.

Those exceeding government limits — 33.5 inches for men and 35.4 inches for women, which are identical to thresholds established in 2005 for Japan by the International Diabetes Federation as an easy guideline for identifying health risks — and having a weight-related ailment will be given dieting guidance if after three months they do not lose weight. If necessary, those people will be steered toward further re-education after six more months.

To reach its goals of shrinking the overweight population by 10 percent over the next four years and 25 percent over the next seven years, the government will impose financial penalties on companies and local governments that fail to meet specific targets. The country's Ministry of Health argues that the campaign will keep the spread of diseases like diabetes and strokes in check.

The ministry also says that curbing widening waistlines will rein in a rapidly aging society's ballooning health care costs, one of the most serious and politically delicate problems facing Japan today. Most Japanese are covered under public health care or through their work. Anger over a plan that would make those 75 and older pay more for health care brought a parliamentary censure motion Wednesday against Prime Minister Yasuo Fukuda, the first against a prime minister in the country's postwar history.

But critics say that the government guidelines — especially the one about male waistlines — are simply too strict and that more than half of all men will be considered overweight. The effect, they say, will be to encourage overmedication and ultimately raise health care costs.

Yoichi Ogushi, a professor at Tokai University's School of Medicine near Tokyo and an expert on public health, said that there was "no need at all" for the Japanese to lose weight.

"I don't think the campaign will have any positive effect. Now if you did this in the United States, there would be benefits, since there are many Americans who weigh more than 100 kilograms," or about 220 pounds, Ogushi said. "But the Japanese are so slender that they can't afford to lose weight."

Ogushi was actually a little harder on Americans than they deserved. A survey by the National Center for Health Statistics found that the average waist size for Caucasian American men was 39 inches, a full inch lower than the 40-inch threshold established by the International Diabetes Federation. American women did not fare as well, with an average waist size of 36.5 inches, about two inches above their threshold of 34.6 inches. The differences in thresholds reflected variations in height and body type from Japanese men and women.

Comparable figures for the Japanese are sketchy since waistlines have not been measured officially in the past. But private research on thousands of Japanese indicates that the average male waistline falls just below the new government limit.

That fact, widely reported in the media, has heightened the anxiety in the nation's health clinics.

In Amagasaki, a city in western Japan, officials have moved aggressively to measure waistlines in what the government calls special checkups. The city had to measure at least 65 percent of the 40- to 74-year-olds covered by public health insurance, an "extremely difficult" goal, acknowledged Midori Noguchi, a city official.

When his turn came, Nogiri, the flower shop owner, entered a booth where he bared his midriff, exposing a flat stomach with barely discernible love handles. A nurse wrapped a tape measure around his waist across his belly button: 33.6 inches, or 0.1 inch over the limit.

"Strikeout," he said, defeat spreading across his face.

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