They use wishful thinking. Body composition scales are crap, don't trust their numbers. Most just run a little current through your legs and then guess some numbers. The error bars on that are so huge that it's basically meaningless to compare between people. The have limited utility for comparing your body composition to your past self.
I'm not sure what TFA's talking about wrt scales showing someone's age as being 1/3 what it actually is -- but the claim:
> They use wishful thinking. Body composition scales are crap, don't trust their numbers.
... is difficult to assimilate.
I use Omron consumer-grade gear - all the in-depth reviews / assessments I've seen suggest it's reasonably accurate (unquote) so long as you're not an outlier (massively overweight, underweight, overly muscular, under/over-hydrated). But in all cases it's great as a trending tool.
I agree smart scales have a massive margin of error for BMI, muscle weight, water %, etc..
That said, they are useful when used on a daily basis over many months. Clear trends show up accurately (I started using a Withings scale 8 months ago and have lost 30lbs in that period, no single measurement is useful and they often swing wildly up and down, but the trend lines over time are what I found valuable, and as accurate as needed, at least for my purposes)
