摘要：Thirty-one percent of U.S. adults
between age 20 and 74 are now
obese. Based on data from the National
Health and Nutrition Examination
Surveys, this level represents
a 100-percent increase over
the prevalence of adult obesity during
1976-80. Increases in obesity
have occurred in both men and
women, in all age groups, and in all
racial and ethnic groups. The reason
for this increase is clear¡ªan
excess of dietary energy intake
over energy expenditure. The causes
behind this growing energy, or
caloric, imbalance are complex, involving
metabolic, behavioral, environmental,
cultural, and socioeconomic
components.
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