Which of the following is a risk factor for developing osteoporosis?

A sedentary lifestyle is a significant risk factor for developing osteoporosis because it can lead to decreased bone density and weaken bones over time. Regular physical activity, especially weight-bearing exercises, plays a crucial role in maintaining bone strength and promoting bone formation. The lack of movement does not provide the mechanical stress that bones need to maintain their density, leading to bone loss.

In contrast, a balanced diet rich in adequate calcium and vitamin D supports bone health, while regular weight-bearing exercises help to stimulate bone growth and strength. Moreover, a family history of strong bones would typically suggest a genetic predisposition towards denser bone formation rather than an increased risk for osteoporosis. Therefore, the correct identification of a sedentary lifestyle as a risk factor highlights the importance of physical activity in the prevention of osteoporosis.