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The prevalence of obesity among children aged 6 to 11 more than doubled in the past 20 years, going from 6.5% in 1980 to 17.0% in 2007. The rate among adolescents aged 12 to 19 more than tripled, increasing from 5% to 17.6%. Obesity is the result of caloric imbalance (too few calories expended for the [...]