Hypocalcaemia owing to severe vitamin D deficiency in two children with autism spectrum disorder and food allergy.

Individuals with autism spectrum disorder (ASD) often exhibit limited food preferences and sensory sensitivity. Co-existing food allergies in this population can further limit their already restricted diets, increasing the risk of nutritional deficiencies. Two children with ASD and food allergies presented with non-specific symptoms and were found to have hypocalcaemia secondary to severe vitamin D deficiency. The report highlights the importance of a greater degree of suspicion of vitamin D deficiency in children with co-existing ASD and food allergies. Non-specific symptoms related to hypocalcaemia can be difficult to evaluate in non-verbal patients. A thorough dietary history is an essential part of the care of children with ASD. It is proposed that limited diets should be screened for common nutritional deficiencies.