Astronauts face a large number of other health risks during their stay in space. In a weightless environment, muscles aren't used as much, which can lead to them weakening and atrophying. Additionally, the lack of gravity causes bones to lose minerals at a faster rate, leading to bone density loss.

NASA astronauts Sunita Williams and Butch Wilmore face health challenges after an extended 160-day mission due to Boeing Starliner issues, with weight loss raising serious concerns.