US sees disproportionate increase in body mass index rates of more than 60. In the past 20 years, the average rate of obesity among Americans has risen by approximately 30%, but the rate of those with the most severe forms of obesity, or those with a BMI of more than 60 kg/m2, increased by 210%.

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3. US sees disproportionate increase in body mass index rates of more than 60. In the past 20 years, the average rate of obesity among Americans has risen by approximately 30%, but the rate of those with the most severe forms of obesity, or those with a BMI of more than 60 kg/m2, increased by 210%.