Patients with celiac disease are at increased risk of osteoporosis due to what mechanism?

Patients with celiac disease are at increased risk of osteoporosis due to what mechanism?

• A. Increased bone loss from decreased calcium and vitamin D absorption
• B. Increased bone formation
• C. No risk of osteoporosis
• D. Risk only in elderly with no malabsorption

Answer: (A)

In celiac disease, damage to the proximal small intestine reduces the absorption of calcium and fat-soluble vitamins, including vitamin D. When calcium and vitamin D absorption are impaired, calcium levels can fall and vitamin D deficiency worsens, prompting secondary hyperparathyroidism. The parathyroid hormone then increases bone resorption to maintain serum calcium, leading to a loss of bone mineral density and osteoporosis. This mechanism explains why these patients have an increased risk of osteoporosis. It’s not about increased bone formation, and the risk stems from malabsorption rather than being limited to elderly individuals without malabsorption. Adherence to a gluten-free diet can improve mucosal healing and absorption over time, which helps bone health.

In celiac disease, damage to the proximal small intestine reduces the absorption of calcium and fat-soluble vitamins, including vitamin D. When calcium and vitamin D absorption are impaired, calcium levels can fall and vitamin D deficiency worsens, prompting secondary hyperparathyroidism. The parathyroid hormone then increases bone resorption to maintain serum calcium, leading to a loss of bone mineral density and osteoporosis. This mechanism explains why these patients have an increased risk of osteoporosis. It’s not about increased bone formation, and the risk stems from malabsorption rather than being limited to elderly individuals without malabsorption. Adherence to a gluten-free diet can improve mucosal healing and absorption over time, which helps bone health.