Micronutrient Testing in Eosinophilic Esophagitis
In patients with eosinophilic esophagitis, you should test for vitamin D, calcium, phosphorus, zinc, vitamin B12, folate, and iron deficiencies, particularly when patients are on elimination diets or have multiple dietary restrictions.
Primary Micronutrients to Monitor
Vitamin D
- Vitamin D deficiency is the most consistently documented nutritional concern in EoE patients, with reported prevalence ranging from 0-52% in pediatric populations 1
- Adult EoE patients demonstrate lower serum 25-hydroxy-vitamin D3 levels compared to controls (adjusted difference of 10.8 ng/mL lower), though frank deficiency (<20 ng/mL) occurs in approximately 20% of cases 2
- Lower vitamin D levels correlate with lamina propria fibrosis, suggesting a potential role in disease severity 2
Calcium and Phosphorus
- Dairy elimination (common in EoE dietary therapy) directly removes major sources of calcium, phosphorus, vitamin B12, and vitamin D 3
- Suboptimal dietary calcium intake has been documented in children with EoE even when serum markers appear normal 3
- These deficiencies carry particular risk for bone health in growing children and adolescents 3
B Vitamins and Iron
- Wheat elimination removes key sources of iron, B vitamins, and fiber 3
- Vitamin B12 and folate intake correlate negatively with peak eosinophil counts, suggesting potential immunomodulatory roles 4
- These deficiencies are especially concerning when multiple food groups are eliminated simultaneously 3
Zinc
- Zinc intake shows a favorable (negative) relationship with disease severity as measured by peak eosinophil count 4
- This micronutrient should be monitored particularly in patients on restrictive elimination diets 4
Clinical Context for Testing
When to Test
- At baseline before initiating elimination diets to establish nutritional status 3
- During active dietary restriction, especially with 4-food or 6-food elimination diets 3
- In patients with concomitant food allergies or lifestyle dietary restrictions (e.g., vegan diets) that compound elimination requirements 3
- In children and adolescents on long-term topical corticosteroids, where bone mineral density monitoring is recommended 3
High-Risk Populations
- Patients eliminating multiple staple food groups (milk, wheat, eggs, soy) 3
- Children with documented feeding difficulties or abnormal feeding behaviors 3
- Patients with suboptimal dietary intake documented on food diaries 3
- Those with concomitant atopic conditions requiring additional dietary modifications 3
Important Caveats
Serum markers may appear normal despite suboptimal dietary intake 3. A systematic review found that while serum nutritional markers were normal in EoE children, 3-day food diaries revealed inadequate calcium and vitamin D intake 3. This underscores the importance of:
- Combining laboratory testing with dietary assessment
- Involving an experienced dietitian throughout elimination and reintroduction phases 3
- Not relying solely on serum levels to assess nutritional adequacy 3
Practical Implementation
Dietitian involvement is strongly recommended when undertaking any dietary restriction therapy 3. The dietitian's role includes:
- Assessing baseline nutritional status and intake 3
- Providing education on accurate food elimination 3
- Advising on appropriate replacement of eliminated food groups 3
- Monitoring for nutritional deficiencies throughout treatment 3
- Managing feeding difficulties, particularly in pediatric patients 3
The risk of nutritional deficiencies increases with the restrictiveness of the elimination diet, with 6-food elimination diets carrying higher risk than 2-food or 4-food approaches, though they also achieve higher remission rates 3.