Why are low gravity humans depicted as TALL?

I totally get why humans who have colonised a low gravity environment (Mars or an asteroid, for instance) are skinny. Muscles doing less work, square cube law, force output of a muscle proportional to its cross-sectional area, etc, etc.

But I don't get where the trope of them being tall comes from? Why would biology bother to go to the effort of making longer bones, when you could save all that calcium and phosphate for something else? Like when person X is growing their bones to 7 foot tall, person B instead uses the resources to build their first baby's skeleton. So to me, a low gravity person with normal sized (but thinner) bones and the expected skinny muscles seems a far more sensible solution for natural (or artificial) selection to have produced.

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Why are low gravity humans depicted as TALL?

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