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Obesity is based on the body mass index, a calculation using height and weight.

肥胖是根据身体质量指数，用身高和体重计算出来的结果。

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Using about 20 years of height and weight data (to determine body mass index) from two large national surveys for the U.S. and the U.K., researchers made forecasts.In the U.S.

通过20年两次的对美英两国国人身高和体重数据（决定了身体重量的指数）的调查，研究人员做出了这样的预测。

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They measured height, weight and body mass index - calculated by dividing weight in kilograms by the square of your height in metres.

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All models were required to have a body mass index -- a ratio of height and weight -- above 18, the minimum limit considered healthy by the World Health Organization.

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The study also took into account body mass index (BMI) - a measure which relates weight to height.

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