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Missions that go as far as Mars will have to make sure astronauts have supplements such as bisphosphonate, which is used to prevent bone breakdown in osteoporosis.

After five years on a bisphosphonate, most people should be assessed to see whether they need to take a break from the medication, Adler says.

But about two years after stopping, if a scan shows decreased bone density, your doctor may put you back on a bisphosphonate.

Sometimes medication, such as a bisphosphonate, can be prescribed to slow the rate of bone loss.

In one trial, Evenity was compared to a placebo; in the other, it was compared to a bisphosphonate.