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It simply is a formula based on a person's weight and height (and gender) that claims to give accurate results. Anyone looking at the diversity of people toshiba can quickly tell that it could not. There are pairs of people with identical heights and weights, one of whom is extremely muscular and fit (and therefore has high body density) who seems somewhat skinny, and the other of whom is flabby and out of shape (and toshiba therefore has much lower body density) who seems pudgy. The BMI approach cannot distinguish between these toshiba two extremes, so it is even worse for people in between. In general, all these (convient and inexpensive) alternatives to hydrostatic weighing have extremely poor accuracy, so poor that any results are virtually meaningless. The only accurate methods necessarily involve actually accurately determining the average body density of a person.
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