How does hypermobile Ehlers‑Danlos syndrome cause nutrient deficiencies?

How Hypermobile Ehlers-Danlos Syndrome Causes Nutrient Deficiencies

Hypermobile Ehlers-Danlos syndrome causes nutrient deficiencies primarily through gastrointestinal dysfunction leading to restrictive eating patterns, malabsorption from motility disorders, and dietary elimination strategies that inadvertently create nutritional gaps. 1, 2

Primary Mechanisms of Nutrient Deficiency

Gastrointestinal Dysfunction and Malabsorption

The fundamental problem stems from the near-universal presence of disorders of gut-brain interaction (DGBI) in hEDS patients—98% meet diagnostic criteria for DGBI 1. The altered connective tissue structure in hEDS creates softer, less stiff tissue that affects the entire GI tract, leading to:

• Abnormal gastric emptying (gastroparesis-like symptoms) that impairs nutrient absorption 1
• Dysmotility throughout the GI tract affecting both nutrient transit and absorption
• Associated autonomic dysfunction (POTS) that further disrupts normal digestive processes 1

Restrictive Eating Patterns

The most significant driver of nutrient deficiency is dietary restriction, not malabsorption alone. Research demonstrates that 62.1% of hEDS patients alter their diet significantly, and 62.3% regularly skip meals 3. This creates a cascade of nutritional problems:

• Avoidant Restrictive Food Intake Disorder (ARFID) is strongly associated with dietary alterations, particularly fear of eating 3
• Patients with ARFID have a 4-fold increased risk of requiring artificial nutrition support (OR: 4.97,95% CI: 2.09-11.8) 3
• Four distinct dietary patterns emerge, with the "low food intake" group showing the highest nutrient inadequacy and greatest need for nutrition support (24%) 2

Specific Nutrient Deficiencies Documented

Research reveals consistent patterns of inadequacy 2, 4:

• Vitamin B deficiency (widespread)
• Vitamin D deficiency (widespread)
• Fiber deficiency (only 24.7% achieve requirements) 2
• Protein deficiency despite paradoxically high protein intake in some groups (77.2g ± 37.8g), suggesting absorption issues 2, 4
• Caloric deficits despite adequate intake, indicating malabsorption 4

Mast Cell Activation Syndrome (MCAS) Contribution

When MCAS coexists with hEDS (common overlap), it creates additional nutritional challenges 1:

• Food triggers cause mast cell degranulation, leading to avoidance of multiple food groups
• Patients require low-histamine diets that are inherently restrictive 1
• The need to avoid triggers (certain foods, alcohol) further narrows dietary options 1

Clinical Consequences

Bone Health Impact

Lower bone mineral density (BMD) is documented in hEDS patients compared to age-matched controls, with significantly lower femoral z-scores (p=0.02,0.004) and spine z-scores (p=0.04) 4. This results from:

• Chronic protein deficiency affecting bone formation
• Vitamin D deficiency impairing calcium absorption
• Overall caloric deficits preventing adequate bone maintenance

Body Composition Changes

Despite normal BMI in many patients, body composition is affected by the combination of reduced protein intake and increased carbohydrate consumption (p=0.03 for both) 4.

Management Algorithm

The 2025 AGA guidelines provide clear direction 1:

1. Provide general nutritional support as foundation

2. Consider specific dietary modifications based on predominant symptoms:

   • Gastroparesis diet (small particle diet) for delayed gastric emptying
   • Low FODMAP diet for bloating/diarrhea
   • Gluten-free or dairy-free if specific intolerances identified
   • Low-histamine diet if MCAS confirmed 1

3. Critical caveat: All dietary interventions MUST include nutritional counseling to avoid the pitfalls of restrictive eating 1

Common Pitfall to Avoid

The greatest risk is iatrogenic harm from overly restrictive diets without proper nutritional oversight. 5 Patients often self-impose multiple dietary restrictions simultaneously (responding to functional dyspepsia, reflux, and perceived MCAS triggers), creating severe nutritional deficits that necessitate artificial nutrition support 3. The "low food intake" dietary pattern group demonstrates this perfectly—highest nutrient inadequacy, highest ARFID scores, and 24% requiring nutrition support 2.

Screening for ARFID is Essential

Screen all hEDS patients with GI symptoms for ARFID, particularly the "fear of eating" component, as this is the strongest predictor of requiring nutrition support and represents a modifiable psychological factor 3. These patients need parallel psychological support alongside dietary management.

The Role of Multidisciplinary Care

While the mechanisms are multifactorial (connective tissue dysfunction → GI dysmotility → DGBI symptoms → dietary restriction → nutrient deficiency), the solution requires coordinated care between gastroenterology, nutrition, and psychology 1, 5. The psychological component (anxiety, depression, ARFID) significantly influences dietary behaviors and must be addressed to prevent progression to artificial nutrition dependence 3.