Why can't humans live without gravity?

Answer 1

Because, since gravity is all around and everywhere all the time, we evolved to live with it, and if you suddenly changed the environment of physical laws and forces to which we spent millions of years adapting ourselves, then naturally we would have a tough time making the sudden change.

On the other hand, it has been clearly demonstrated that humans CAN live without gravity, at least for a time. Astronauts in orbit and in transit to and from the moon do not experience the effects of gravity, yet live quite well vor months at a time - in the space station, for example.

Answer 2

Humans rely on gravity for many bodily functions such as blood circulation, balance, and muscle strength. Without gravity, muscles would weaken, bones would lose calcium, and bodily fluids would redistribute causing health issues. Additionally, lack of exposure to gravity could have negative effects on cognitive function and mental well-being.

Answer 3

For a start, they wouldn't stay on Earth long. Without gravity, people would be flung into space. Earth itself would soon disintegrate.