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Calcium Absorption Disorder – Causes and Treatment

A calcium absorption disorder refers to the reduced uptake of calcium in the intestine. It can lead to bone loss, muscle cramps, and other health complications.

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Things worth knowing about "Calcium Absorption Disorder"

A calcium absorption disorder refers to the reduced uptake of calcium in the intestine. It can lead to bone loss, muscle cramps, and other health complications.

What Is a Calcium Absorption Disorder?

A calcium absorption disorder occurs when the intestine is unable to adequately absorb calcium from food. Calcium is an essential mineral required for building and maintaining bones and teeth, supporting muscle and nerve function, and enabling blood clotting. When calcium is not sufficiently absorbed, it can lead to serious long-term health consequences.

Causes

There are several conditions and factors that can impair calcium absorption:

Vitamin D deficiency: Vitamin D is essential for intestinal calcium absorption. A deficiency directly reduces the amount of calcium the body can take up.
Gastrointestinal diseases: Conditions such as celiac disease, Crohn's disease, short bowel syndrome, or lactose intolerance can damage the intestinal lining and impair absorption.
Hypoparathyroidism: Insufficient parathyroid hormone (PTH) reduces the activation of vitamin D, thereby lowering calcium uptake.
Kidney disease: The kidneys play a critical role in activating vitamin D; chronic kidney disease can therefore impair calcium absorption.
Medications: Certain drugs such as corticosteroids, proton pump inhibitors, or antiepileptic medications can interfere with calcium absorption.
Age: Intestinal calcium absorption naturally becomes less efficient with increasing age.
High dietary oxalate or phytate content: These compounds can bind calcium in the gut and prevent its uptake.

Symptoms

A calcium absorption disorder often goes unnoticed for a long time. However, when blood calcium levels drop persistently (hypocalcemia), the following symptoms may occur:

Muscle cramps and spasms (tetany)
Tingling and numbness, especially in the hands, feet, and around the mouth
Bone pain and increased susceptibility to fractures (osteoporosis or osteomalacia)
Fatigue and general weakness
Cardiac arrhythmias in severe cases
Low mood and difficulty concentrating

Diagnosis

Diagnosing a calcium absorption disorder involves several investigations:

Blood tests: Measurement of calcium levels, parathyroid hormone (PTH), vitamin D (25-OH-vitamin D), phosphate, and magnesium.
Urine tests: Assessment of calcium excretion via a 24-hour urine collection.
Bone density scan (DXA): To evaluate the impact on bone health.
Intestinal diagnostics: If an underlying gastrointestinal disease is suspected, gastroscopy, colonoscopy, or biopsy may be required.

Treatment

Treatment depends on the underlying cause of the absorption disorder:

Treating the Underlying Condition

If an intestinal disease such as celiac disease is responsible, treating this condition is the primary goal, for example through a strict gluten-free diet.

Vitamin D Supplementation

Since vitamin D is crucial for calcium absorption, ensuring adequate vitamin D levels is often the first step in treatment. This may involve dietary supplements or, in cases of severe deficiency, pharmaceutical preparations.

Calcium Supplementation

In many cases, calcium supplements are prescribed to compensate for the deficiency. Correct dosing and timing of intake are important, as excessive doses can cause side effects such as kidney stones.

Dietary Adjustments

A calcium-rich diet including dairy products, leafy green vegetables, almonds, and calcium-rich mineral water can provide additional support. At the same time, consuming high-oxalate or high-phytate foods together with calcium-rich meals should be minimized.

Osteoporosis Treatment

If bone loss has already occurred, additional medications such as bisphosphonates or other osteoporosis therapies may be prescribed.

References

Peacock M. - Calcium metabolism in health and disease. Clinical Journal of the American Society of Nephrology, 5(Suppl 1):S23-S30 (2010). PubMed PMID: 20089499.
Holick MF. - Vitamin D deficiency. New England Journal of Medicine, 357(3):266-281 (2007). PubMed PMID: 17634462.
World Health Organization (WHO): Calcium supplementation in pregnant women. WHO Guidelines (2013). www.who.int.

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