Which of the following measures has not been shown to help lower the risk of osteoporosis?

Drinking organic juice does not have a proven impact on lowering the risk of osteoporosis. While certain juices, such as fortified orange juice, may contain added calcium or vitamin D, organic juice in general is not specifically associated with any measurable effect on bone density or osteoporosis risk when compared to other lifestyle measures.

In contrast, the other options are well-supported by research. Consuming low-fat dairy foods is beneficial due to their calcium content, which is crucial for maintaining bone health and preventing osteoporosis. Performing weight-bearing exercises is also an established method for enhancing bone strength, as these activities stimulate bone formation. Additionally, vitamin D supplementation has been shown to improve calcium absorption and bone mineralization, thereby helping to reduce the risk of osteoporosis.

Therefore, the selection identifies drinking organic juice as the option that lacks established benefits in this context.