http://news.yahoo.com/s/afp/20060426/hl_afp/healthobesityusPARIS (AFP) - The prevalence of obesity in the US states has been under-estimated by as much as 50 percent, according to a study.
In 2002, 28.7 percent of adult American men and 34.5 percent of American women were clinically obese, compared to the conventional estimates for that year of 21.9 percent and 21.2 percent respectively, it says.
The research, published in Britain's Journal of the Royal Society of Medicine by Harvard School of Public Health specialists, blames the discrepancy on low-cost data-collection -- and human nature.
The main tool for measuring obesity in the United States is the Behavioral Risk Factor Surveillance System (BRFSS), which uses telephone interviews with a cross-section of the population to get its data.
But the researchers say that, in these phone interviews, women of all ages often under-report their weight, and young and middle-aged men often over-report their height.