-- Robert Preidt
TUESDAY, July 8, 2014 (HealthDay News) -- Lack of exercise --
and not a tendency to eat too much -- may explain why an increasing
number of Americans are obese, a new study suggests.
Researchers analyzed U.S. government data from the last 20 years
and found that the number of women who reported no physical
activity rose from about 19 percent in 1994 to nearly 52 percent in
2010. The number of men who said they didn't exercise increased
from about 11 percent to about 43 percent.
Black and Mexican-American women showed the greatest decreases
in reported exercise, the study authors found.
During the study period, there was an increase in adults'
average body mass index (BMI), an estimate of body fat based on
height and weight, with the most dramatic rise among women aged 18
to 39. The researchers also found increased rates of abdominal
obesity, especially among women.
At the same time, calorie intake among adults remained steady
during the study period, according to the findings reported
recently in the
American Journal of Medicine.
While the investigators found an association between inactivity
and the obesity epidemic, the study did not prove a
"Our findings do not support the popular notion that the increase of obesity in the United States can be attributed primarily to sustained increase over time in the average daily caloric intake of Americans," lead investigator Dr. Uri Ladabaum, an associate professor of medicine at Stanford University School of Medicine, said in a journal news release.
"Although the overall trends in obesity in the United States are well appreciated and obesity prevalence may be stabilizing, our analyses highlight troublesome trends in younger adults, in women, and in abdominal obesity prevalence, as well as persistent racial/ethnic disparities," Ladabaum added.
Pamela Powers Hannley, journal managing editor, wrote in an
accompanying commentary: "If we as a country truly want to take
control of our health and our health care costs, [this study]
should be our clarion call. From encouraging communities to provide
safe places for physical activity to ensuring ample supply of
healthy food to empowering Americans to take control of their
health, we must launch a concerted comprehensive effort to control
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