Why should astronauts be aware of bone loss when working in space, even for a short period of time?

A. Not enough stress is placed on the bones, making them weaker.
B. Dehydrated food from tubes weakens bones.
C. Excessive force during take-off and landing increases bone stress.
D. Not enough calcium to become available to build bones.

Question

Why should astronauts be aware of bone loss when working in space, even for a short period of time? 



 A. Not enough stress is placed on the bones, making them weaker. 
 B. Dehydrated food from tubes weakens bones. 
 C. Excessive force during take-off and landing increases bone stress. 
 D. Not enough calcium to become available to build bones.

freethinker · Answer

the reason we have strong bones is not only due to our calcium intake, but also the gravity that pushes us down. I believe cosmonauts devised an exercise to prevent this from occurring, but studies showed that even with this it will not be very helpful or has minimal effect.