[josephcooney]

But weight by itself (and BMI) are fairly crude measures. You could be 6' tall, be a muscular 210 lbs with a body fat of 10% and be classed as obese. The next level of the "onion" is body composition (fancy scales do this, but not that well). Then you're getting dexa scans....and there are probably other levels after that. I think I'd rather know if my weight and body fat % are going up or down, rather than their absolute value.

[pmiller2]

Le sigh. I should have known someone would throw that particular nitpick.

That’s an edge case. People who fall in that category already know that. And they’re very interested in their accurate, absolute weight.

Besides, BMI is just a convenient way of quantifying what a “healthy weight range” is. I could have used any range and said I was interested in weighing between X and Y.

[josephcooney]

I am kind of in that category...and I'm interested in relative fluctuations in body fat % even though I don't give much credence to the absolute accuracy of the body fat measure.