RT Journal A1 Koplan JP, Dietz WH T1 CAloric imbalance and public health policy JF JAMA JO JAMA YR 1999 FD October 27 VO 282 IS 16 SP 1579 OP 1581 DO 10.1001/jama.282.16.1579 UL http://dx.doi.org/10.1001/jama.282.16.1579 AB Obesity is epidemic in the United States. More than 50% of US adults are now overweight, based on a body mass index (BMI) of 25 kg/m2 or more.1 Furthermore, 22% of the US adult population is obese, based on a BMI of 30 kg/m2 or more, equivalent to approximately 13.5 kg (30 lb) overweight. Three percent of US adults have a BMI of 40 kg/m2 or more, which represents a weight excess of approximately 45 kg (100 lb). Blacks and Hispanics are disproportionally affected. As the study by Mokdad and colleagues in this issue of THE JOURNAL2 clearly demonstrates, the increase in the prevalence of obesity has been rapid. No area of the country has been spared.