How can i prevent osteoporosis?

Not always possible: Hi. Assuming no diseases that cause bone loss, you can help prevent osteoporosis with adequate calcium and vitamin D intake, healthy diet, weight-bearing exercise, and no smoking. There are drugs that can be used to help prevent osteoporosis in the setting of osteopenia, including bisphosphonates, the SERM raloxifene (in women), and estrogen use (in women). As a 25 yo man, your risk is very low.