Why can eating large amounts of protein be a risk factor for osteoporosis?

Eating large amounts of protein can be a risk factor for osteoporosis primarily because it can lead to more calcium loss through the kidneys. When there is a high intake of protein, especially from animal sources, the body produces more acid due to protein metabolism. To neutralize this acidity, the body may draw calcium from the bones, which can subsequently increase the excretion of calcium through the kidneys. Over time, this can lead to lower calcium levels in the bones, potentially increasing the risk of osteoporosis.

In contrast to the other choices, they do not directly relate to the impact that excessive protein intake has on calcium metabolism and bone health. While dehydration can occur due to various reasons in individuals with high protein diets, it is not primarily linked to osteoporosis risk. The statement regarding fat absorption does not connect to the mechanisms of protein metabolism concerning bone health. Lastly, while stimulating excessive bone formation sounds beneficial, high protein intake is not related to promoting bone density but may actually have an adverse effect by increasing calcium loss.