A nurse is working with a community group promoting healthy aging. What recommendation is best to help prevent osteoarthritis (OA).

Choice A rationale Avoiding contact sports may help prevent acute traumatic joint injuries, but the primary pathology of osteoarthritis is chronic, progressive cartilage degradation often related to excessive mechanical stress or joint damage. This is not the most universal or effective preventive measure for the general population. Choice B rationale Getting plenty of calcium is crucial for bone health and preventing osteoporosis, a condition characterized by low bone mass. However, calcium intake does not directly prevent or slow the joint cartilage damage that is the hallmark of osteoarthritis (OA). Choice C rationale Excessive body weight significantly increases the mechanical stress and load placed on weight-bearing joints, particularly the knees and hips, accelerating the degeneration of articular cartilage. Weight loss reduces this chronic joint stress, making it the most effective modifiable factor for OA prevention. Choice D rationale While regular, moderate, non-impact weight-bearing exercise is beneficial for joint health, excessive or high-impact weight-bearing exercise can actually contribute to the wear and tear on cartilage, potentially increasing the risk of OA in susceptible individuals or damaged joints.