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Good_Burning_Plastic comments on We have the technology required to build 3D body scanners for consumer prices - Less Wrong Discussion
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We have had cheap bathroom scales measuring body fat percentages (not terribly accurately, but still better than guessing from the BMI) for a while; if those didn't "move us past the BMI", why do you think a device two orders of magnitude more expensive would?
Cheap scales don't measure body fat uniformly. They ignore arm composition. For the purposes of standarization they give different answers than the expensive devices used in clinical studies.
Fitness studies also measure more than body fat. They measure the circumference of various body regions. I don't think a measurement that doesn't take into account the shape of a body produce a good answer.
Most medical devices that set standards aren't very cheap. Very cheap devices give nobody an incentive to run the studies