What is osteoporosis characterized by?

Osteoporosis is characterized by a decrease in bone strength, which refers to the reduction in both bone density and structural integrity of the bones. This condition makes bones more fragile and increases the risk of fractures. It results from an imbalance between bone resorption (the process where bone is broken down) and bone formation. When the rate of bone loss outpaces the creation of new bone, the overall bone density decreases, leading to the characteristic fragility associated with osteoporosis.

In contrast, the other options discuss aspects that are not indicative of osteoporosis. Healthy bone development and increased muscle mass would be signs of good health and physical fitness, while increased bone density suggests stronger bones, which directly contradicts the condition of osteoporosis. Understanding the nature of osteoporosis helps to emphasize the importance of prevention and management strategies, such as weight-bearing exercises and adequate nutrition, to maintain bone health.