The 2000 US Census estimates the adult population ≥ 20 years and < 70 years at 185,634,000 persons. Prevalence estimates, using NHANES III data obtained a few years previously, are 2.8% for US adults with a body mass index (BMI) ≥40 kg/m2 and 8% for those with a BMI ≥35 kg/m2,[37] These numbers approximate to six million morbidly obese adults and another 9.6 million (8.0-2.8 =5.2%) with BMI >35 but <40. The relative risk for all cause mortality is increased at BMI levels ≥30 kg/m2.
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