Body Mass Index, a ratio of a person’s height and weight, has effectively become a proxy for whether a person is considered healthy. But a new study has found that using BMI to gauge health incorrectly labels more than 54 million Americans as “unhealthy,” even though they are not.

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Body Mass Index, a ratio of a person’s height and weight, has effectively become a proxy for whether a person is considered healthy. But a new study has found that using BMI to gauge health incorrectly labels more than 54 million Americans as “unhealthy,” even though they are not.