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Weight Perceptions continued...

Rahman noticed ethnic differences. African-Americans were more likely to underestimate their BMI while white and Hispanic women were more likely to overestimate it.

Overweight women who had gone to college and who used the Internet (presumably reading about weight information) were less likely than others to misperceive body weight.

The dangers? Those who didn't perceive their weight correctly, Rahman says, were more likely to engage in unhealthy behaviors. The overweight women who thought they were normal weight didn't cut back on food intake, for instance.

The normal-weight women who thought they were overweight were more likely to use diet pills or diuretics or smoke cigarettes.

One bright spot: Among overweight women who knew they were overweight, 35.9% said they ate differently or less in the past 30 days, in attempts to shed weight.

Rahman says the finding that so many overweight women view their body weight as normal reflects the ''fattening of America." "They see overweight people everywhere they go," he says, and that becomes, for them, the new norm.

Rahman worries the trends will continue "unless we see a rapid change in the mind-set of people."

Second Opinion

The ''fattening of America'' explanation given by Rahman for why so many overweight women think they are normal weight makes sense to Cheryl Rock, PhD, RD, a professor of family and preventive medicine at the University of California San Diego School of Medicine, who reviewed the findings for WebMD.

"It might very well be if you look around and you're not fatter than anyone you hang out with, then you don't perceive yourself as being overweight," she says. "You look like everyone else."

Doctors should take note of the findings, she says, and ''have an eye open to those who are overweight and don't think they are," offering weight loss counseling.

"Find out your BMI,'' Rahman advises. You can ask your doctor to tell you, or you can plug in your height and weight on the BMI calculators widely available online.

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