they go on about Nasa or Elon Musks attemp to populate Mars , but i don't think so ,

biggest problem is radiation exposure en route

which is about 700 times the amount they're exposed to in earth orbit/aboard ISS

It doesn't take months of hospitalisation! Yes they require a little assistance but the reason when astronauts return to earth you often see them sitting in little chairs right after getting out of the spacecraft (or you did when they use Russian Soyuz ones) is not because they can't walk, but you do lose a bit of stamina in walking, and after months of living in freefall it can initially be a bit disorientating. (The biggest problem apparently is that returning astronauts forget they can't just let go of something and expect it to stay there, and they drop a lot of things!)

One of the reasons why we have people living in space for months at a time is to build up data on how to look after people living in weightless conditions.

They lose bone density and muscle mass as well as often suffer speech and vision problems. It must screw up their health permanently as it's not natural.

Mars Attack