What is an effect of calcium deficiency related to bone health?

A calcium deficiency significantly impacts bone health by leading to brittle bones, a condition known as osteopenia or osteoporosis in more severe cases. Calcium is essential for the maintenance of bone structure and strength, as it is a primary mineral component of bone tissue. When there is insufficient calcium, the body may begin to demineralize bone tissue in order to maintain necessary levels of calcium in the bloodstream, resulting in bones that are weaker and more prone to fractures.

The body's ability to repair and remodel bones suffers without adequate calcium, leading to an increased risk of damage. This brittleness can manifest not just in terms of susceptibility to fractures but also as a reduction in the overall density of the bones, which can compromise physical mobility and quality of life.

Other options reflect scenarios that would not typically occur due to calcium deficiency. Increased bone density runs counter to what occurs with low calcium levels. Flexibility in bones is more associated with soft tissue rather than bone strength and structure, and increased muscle mass is not directly influenced by calcium levels in relation to bone health. Thus, brittle bones are a clear and direct consequence of inadequate calcium intake.