It’s not “suddenly inaccurate”; there are better methods now.
BMI was NEVER a great method, but it was better than nothing.
The problem with it is that it doesn’t distinguish between fat and muscle, body water weight, bone density, and many other factors.
As a result, you could have an incredibly fit person with a BMI that shows them as being obese. I myself have had BMI results showing that I’m “morbidly obese”, but I’m clearly not. I work out a lot and have a higher muscle mass.
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