Without gravity working on the human body, bones lose minerals, and bone density decreases by 1% monthly. In comparison, the rate of bone loss for the elderly is between 1-1.5% yearly. The excretion of calcium from bones in space also places those in low gravity at a higher risk of kidney stones.
Without gravity acting on the human body, bones lose minerals and become weaker, with a monthly decline of 1%. In comparison, elderly individuals experience bone loss at a slower rate of 1-1.5% annually. Additionally, space travel's lack of gravity increases the risk of kidney stones in those exposed to it.