Astronauts have to exercise daily to prevent bone and muscle loss during long stays on space stations, but I assume this is all in preparation for when they return to the normal gravity of Earth. If it was certain that a person was going to spend the rest of his life in a microgravity environment, would these exercises be necessary? Would there be any harmful effects or deterioration eventually?

  • $\begingroup$ When an organism has been specialized for a gravitational environment over billions of years, there are bound to be detrimental effects of removing them from that environment. BTW - is 'dulling of sense of taste' considered 'harmful'? $\endgroup$ – Andrew Thompson Mar 22 '16 at 21:02
  • $\begingroup$ There is not sufficient data to answer this question. Also, many possible harmful effects are possible and it would be difficult to cover them all briefly and stay within the length of answer normally provided. $\endgroup$ – kim holder Mar 22 '16 at 22:56
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    $\begingroup$ See this question for the best of our knowledge: space.stackexchange.com/questions/8839/… $\endgroup$ – horsh Mar 23 '16 at 0:12