Astronaut’s Brains Need Three Years Off Between Trips, Say Scientists

https://www.forbes.com/sites/jamiecartereurope/2023/06/08/astronauts-brains-need-three-years-off-between-trips-say-scientists/?sh=3342ee942829 

This is something that people need to think about if the are pursuing a career in space exploration and any kind of research in space on the ISS. There are a few differences in the physical body when in space such as the increase in the size of the spine. 

https://www.hopkinsmedicine.org/news/newsroom/news-releases/back-pain-common-among-astronauts-offers-treatment-insights-for-the-earth-bound#:~:text=The%20Spine%20Changes%20in%20Space&text=Some%20of%20the%20earliest%20data,reduced%20curve%20in%20their%20spine.

https://www.nasa.gov/mission_pages/station/research/news/find-increase-red-blood-cell-destruction

Changes to blood in space.