Vitamin D Deficiency Is Common in Children With Type 1 Diabetes—But the Relationship Is Complex

Vitamin D, parathyroid hormone, and calcium work together in the body to keep calcium at healthy levels. Because insulin—the hormone that is missing or not working properly in Type 1 diabetes—depends on calcium to function correctly, researchers have wondered whether vitamin D deficiency might affect people with Type 1 diabetes differently than it affects others.

To explore this question, scientists at Al Jalila Children's Specialty Hospital in Dubai studied 102 children and teens with Type 1 diabetes, aged 3 to 18 years old.

The researchers measured vitamin D, parathyroid hormone (PTH), calcium, and phosphate levels in all participants. They found that 73.3% of the children had insufficient vitamin D levels—a notably high rate.

Surprisingly, most of these children (63.2%) had normal parathyroid hormone levels. Even more interesting: when researchers looked at children with low vitamin D and normal PTH, 83.3% of them still had normal calcium levels. This suggests their bodies were able to maintain calcium balance despite the vitamin D deficiency.

The study did not find significant connections between vitamin D deficiency and parathyroid hormone levels, phosphate levels, vitamin D supplementation, or other health conditions the children had.

This study shows that vitamin D deficiency is very common in children with Type 1 diabetes, at least in this population in the UAE. However, it also reveals that low vitamin D alone does not appear to immediately throw the body's calcium regulation system off balance.

The findings suggest that children with Type 1 diabetes may have some ability to compensate for vitamin D deficiency in the short term. However, this is a single study with a relatively small group of participants, and we don't yet know what the long-term effects of persistent vitamin D deficiency might be.

If you're a parent of a child with Type 1 diabetes concerned about vitamin D levels, talk with your child's healthcare team. They can discuss whether vitamin D testing or supplementation makes sense for your child based on their individual situation.

Source: Journal of diabetes. Evidence type: PubMed indexed literature. Type1Cure is an information and intelligence hub, not a medical advice service. This article summarizes published research and does not provide diagnosis, treatment, or personal medical guidance. Always talk to your own care team before changing anything about your Type 1 diabetes management.