When it comes to defining a healthy weight, most of us would refer to body mass index, or BMI.This figure is a measure of weight-to-height ratio, which is used internationally by doctors to indicate a person's risk of a host of diseases. And we've long been taught that a BMI between 18.5 and 24.9 is the healthiest - giving us the best possible chance of preventing diseases like , heart disease and even some cancers.
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