Vitamin D2026-06

Elimination Diets, Not Food Selectivity, Are Associated with Reduced Nutritional Status in Children with Autism Spectrum Disorder.

Grębska Paula, Fedorczak Anna, Pytrus Tomasz, Dębińska Anna et al. — Nutrients

Summary

This study examined the nutritional health of children with autism spectrum disorder (ASD). It found that children with ASD often have very low vitamin D levels if they don't take supplements. The research also suggested that restrictive "elimination diets," often used without medical advice, were linked to lower body weight in these children, more so than just being a picky eater.

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Key points

Children with Autism Spectrum Disorder (ASD) frequently experience vitamin D deficiency, especially without supplementation.
Elimination diets, often implemented without medical guidance, were linked to lower body mass index (BMI) in children with ASD.
Being a picky eater (food selectivity) alone was not associated with poor nutritional status in this study.
The findings highlight the importance of careful dietary management and vitamin D supplementation for children with ASD.

What the study looked at

What question the study asked: Researchers wanted to understand how dietary habits, specifically picky eating and restrictive elimination diets, affect the nutritional health of children with Autism Spectrum Disorder (ASD). They also looked at specific nutrient levels like vitamin D. How it was studied (design/participants): The study involved 103 children, including 75 with ASD and 28 without ASD (control group). Their nutritional status was assessed using physical measurements like height and weight, and blood tests to check for nutrient levels. The researchers then analyzed the relationship between these nutritional markers and the children's diets. What it found: The study found that children with ASD who were not taking supplements had a significantly higher rate of vitamin D deficiency compared to the control group. It also revealed that children on elimination diets, many of which were not medically prescribed, had a lower Body Mass Index (BMI). Interestingly, simply being a picky eater was not linked to overall poor nutritional status in this group.

Dietary takeaway

For children with ASD, this study suggests that careful attention to diet is important, particularly regarding restrictive eating patterns. Given the high prevalence of vitamin D deficiency found, ensuring adequate vitamin D intake, potentially through supplements under medical guidance, is crucial. While this research offers valuable insights, it's just one study, and dietary decisions for children should always be made in consultation with healthcare professionals.

Abstract

Autism spectrum disorder (ASD) is a neurodevelopmental condition characterized by deficits in social communication, restricted and repetitive behaviors, and sensory processing abnormalities, including food selectivity. Due to the lack of effective causal therapies, alternative approaches such as dietary interventions are increasingly being explored. This study aimed to assess the impact of dietary factors on the nutritional status of children with ASD. A total of 103 children (75 with ASD and 28 controls) were included. Nutritional status was assessed using biochemical markers and standardized anthropometric measurements. Associations between nutritional status and dietary factors, particularly elimination diets implemented either on medical indications or in the absence of clinical justification, were analyzed. ASD diagnosis was independently associated with lower height SDS (Standard Deviation Score). Food selectivity was significantly associated with growth patterns: children with food selectivity showed a higher prevalence of short stature compared with the control group (15.2% vs. 0%, = 0.033). Children following elimination diets had significantly lower BMI SDS compared with those without dietary restrictions (-0.35 [-1.29 to 0.05] vs. -0.22 [-0.78 to 1.14], = 0.046), although only 11.1% had medical indications for such interventions. Among non-supplemented participants, vitamin D deficiency was significantly more prevalent in the ASD group (84.6% vs. 33.3%, < 0.001). Elimination diets were the only dietary factor associated with a clinically relevant reduction in BMI SDS in children with ASD. Food selectivity alone was not associated with impaired nutritional status. Most elimination diets were implemented without confirmed medical indications. These findings highlight the importance of evidence-based dietary management and routine vitamin D supplementation in this population.

View on PubMed →DOI: 10.3390/nu18122008