What might be a symptom of an active person who does not get enough calcium in their diet?

• A. Muscle cramps.
• B. Fatigue during exercise.
• C. Decreased bone density (and eventually osteoporosis).
• D. All of the above.

Answer: (D)

Verified step by step guidance

1. Understand the role of calcium in the body, especially for active individuals. Calcium is essential for muscle contraction, nerve function, and maintaining strong bones.
2. Recognize that insufficient calcium intake can lead to muscle cramps because calcium ions are crucial for muscle fibers to contract and relax properly.
3. Consider that fatigue during exercise may occur due to impaired muscle function and nerve signaling when calcium levels are low.
4. Acknowledge that long-term calcium deficiency affects bone remodeling, leading to decreased bone density and increasing the risk of osteoporosis.
5. Conclude that all these symptoms—muscle cramps, fatigue during exercise, and decreased bone density—can be linked to inadequate calcium intake in an active person.