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's influence on the human body, bones lose minerals, leading to a decrease in bone density by 1% monthly. In contrast, the rate of bone loss in elderly individuals is between 1-1.5% annually. The excretion of calcium from bones in space also increases the risk of kidney stones for those in low gravity.