世卫组织对体重过重的定义是，身体质量指数(BMI)等于或大于25，肥胖症为身体质量指数等于或大于30。
WHO defines overweight as having a body mass index (BMI) equal to or more than 25, and obesity as a BMI equal to or more than 30.
在最近的约15年里，我已分享了很多和你们一起学习到的东西，所以你们或许知道最好的就是保持一定的身体质量指数(BMI) (BMI参考值在25或更低)。
Over the last 15 years or so, I've Shared a lot of what I've learned with you, so you probably know that maintaining a certain Body Mass Index (BMI) is best. (a BMI of 25 or under, FYI.)
身体质量指数等于或大于30时为肥胖。
身体质量指数等于或大于25时为超重。
2487名研究参与者都是体重超标或肥胖者，身体质量指数(BMI)在27至45之间(BMI正常值在18.5至24.9之间)。
The 2, 487 study participants were all either overweight or obese, with a BMI of 27 to 45 (a BMI of 18.5 to 24.9 is considered normal weight).
杜克大学的研究使用身体质量指数测量肥胖，这是一个体重对身高的比率。肥胖的定义是身体质量指数在30或30以上。
The Duke study measured obesity using body-mass index, which is a ratio of weight to height. Obesity is defined as a BMI of 30 or more.
依据身体质量指数高于或低于25，研究员将参与者分成了两组：偏瘦组和超重组。
Researchers divided the groups into two categories: lean and overweight, depending on whether their BMI was above or below 25.
不过，这份医学报告的作者称，那些患有心脏病但身体质量指数有在正常范围之内的病人，如果他们腰围超标或腰围与臀围比例失调，医生应该尽量建议他们减肥减重。
However, the study authors say doctors should advise patients with heart disease with normal BMIs to shed weight if they have a large waist or high waist-to-hip ratio.
不过，这份医学报告的作者称，那些患有心脏病但身体质量指数有在正常范围之内的病人，如果他们腰围超标或腰围与臀围比例失调，医生应该尽量建议他们减肥减重。
However, the study authors say doctors should advise patients with heart disease with normal BMIs to shed weight if they have a large waist or high waist-to-hip ratio.
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