严重肥胖被定义为体重指数为40或更大。
Severe obesity is defined as having a body mass index (BMI) of 40 or greater.
人体体重指数在大概24为好(用体重除以高度的平方就得出体重指数，体重单位为千克，高度单位为米)。
A body mass index (BMI, your weight in kilograms divided by the square of your height in metres) of around 24 is good.
体重指数为35 - 39.9(即肥胖症)，并且有严重的体重相关健康问题，如2型糖尿病、高血压或严重睡眠呼吸暂停综合症。
Your BMI is 35 to 39.9 (obesity), and you have a serious weight-related health problem, such as type 2 diabetes, high blood pressure or severe sleep apnea.
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