Magnesium and Calcium in Cystic Fibrosis: Why It’s Important to Monitor Micronutrient Levels

In recent years, the respiratory and nutritional status of patients with cystic fibrosis has improved significantly. This has been made possible by the availability of modern nutritional supplements, improved forms of enzymes, and specialized vitamin complexes designed specifically for the needs of patients with CF. As a result, obvious vitamin and mineral deficiencies are less common (with the exception of vitamin D).

But this does not mean that you can reduce your attention to monitoring your nutritional status.

In this article, we draw your attention to two important microelements — magnesium and calcium — that are crucial for muscle, nervous system, and bone health.

Magnesium (Mg)

Magnesium is involved in many vital processes — it is necessary for muscle contraction, nerve impulse transmission, and bone health.

In patients with CF, its deficiency may be associated with:

• renal loss of magnesium (e.g., after taking aminoglycosides),
• intestinal malabsorption,
• malnutrition,
• diabetes,
• the effects of certain medications.

Why is this important?

Magnesium deficiency may reduce the effectiveness of therapy, including treatment with recombinant DNA, and cause secondary potassium and calcium deficiencies.

Important to know:

Excessive magnesium intake may cause diarrhea.
In case of significant deficiency, intravenous administration may be necessary.

Currently, regular monitoring of magnesium levels in the blood is not mandatory for patients with cystic fibrosis, as there is no sufficient scientific basis for this. However, doctors should assess the risks individually.

Calcium and bone health

Calcium is the basis of bone and dental health. Its sufficient intake is especially important for children and adolescents, since it is during this period that bone mass and density are formed.

Patients with cystic fibrosis may have reduced bone density due to:

• specificities of the CFTR protein,
• prolonged use of corticosteroids,
• vitamin deficiency (D, K),
• insufficient physical activity,
• delayed sexual development,
• chronic inflammatory processes.

Causes of calcium deficiency:

insufficient consumption of foods with calcium,
impaired absorption in the intestine,
vitamin D deficiency.

It is worth paying attention to:

In patients with fat malabsorption, undigested fat binds calcium, which reduces its ability to bind oxalates in the intestine. This increases the risk of kidney stones.

The daily requirement for calcium depends on age and gender.

Remember: calcium is not always included in CF vitamin complexes, so its level should be monitored at least once a year.

What is important to know right now

The effect of highly effective CFTR modulators on the micronutrient balance of patients with cystic fibrosis is still being studied. Therefore, each patient should:

• get checked regularly,
• follow the doctor’s recommendations carefully,
• maintain a balanced diet taking into account individual needs.

Your health is in your hands. Monitor your indicators, eat well, and don’t be afraid to ask your doctor questions!