22q13 deletion / Phelan-McDermid Syndrome diet. Is there a diet which improves the quality of life of people with 22q13 deletion / Phelan-McDermid Syndrome?

There is currently no specific "Phelan-McDermid syndrome diet" that has been proven to cure or directly treat the underlying genetic cause of 22q13 deletion syndrome. While some families report improvements in gastrointestinal comfort and behavior through individualized dietary adjustments, these are largely anecdotal and should be approached as supportive care under the guidance of a clinical team.

Are there specific dietary recommendations for Phelan-McDermid syndrome?

Because Phelan-McDermid syndrome (also known as 22q13 deletion syndrome) is a genetic condition involving the SHANK3 gene, no single diet serves as a primary treatment. However, many individuals with Phelan-McDermid syndrome experience significant gastrointestinal issues, such as chronic constipation, gastroesophageal reflux (GERD), or food selectivity. Management focuses on addressing these secondary symptoms. Clinical nutritionists often recommend a diet rich in fiber and fluids to manage motility issues, which are common in patients with 22q13 deletion.

How can nutrition help manage common symptoms?

Many caregivers within the DiseaseMaps community, which currently includes 35 members affected by Phelan-McDermid syndrome, report that addressing sensory processing issues is key to nutrition. Children and adults with this condition may have restricted food preferences due to texture sensitivities. Strategies to improve quality of life include:

• High-fiber intake: Essential for managing the chronic constipation frequently seen in Phelan-McDermid syndrome.


• Texture-modified foods: If chewing or swallowing difficulties are present, working with a speech-language pathologist to determine safe food consistencies is vital.


• Hydration monitoring: Increased fluid intake is critical, especially for those on medications that may cause dry mouth or dehydration.


• Scheduled meal times: Establishing a predictable routine can help reduce anxiety-related eating behaviors.

What about specific diets like ketogenic or anti-inflammatory?

There is currently no robust clinical evidence supporting the use of ketogenic, gluten-free, or casein-free diets specifically for Phelan-McDermid syndrome. While some parents report anecdotal success with elimination diets in reducing behavioral outbursts, these results are not supported by large-scale clinical trials. Before implementing restrictive diets, it is essential to consult with a registered dietitian to ensure the individual is receiving adequate macro- and micronutrients, as individuals with 22q13 deletion are already at risk for nutritional deficiencies due to food selectivity.

Do nutritional supplements provide any benefits?

Research into targeted supplements for Phelan-McDermid syndrome is ongoing but remains in the early stages. Some clinicians may suggest vitamin D or iron supplements if blood tests confirm a deficiency, which is common in individuals with limited diets. However, there is no standardized "cocktail" of supplements recommended for the condition. Always discuss any over-the-counter supplements with a physician, as they can interact with medications used to manage seizures or behavioral symptoms associated with the syndrome.

Next steps

• Consult with a board-certified pediatric gastroenterologist to investigate chronic constipation or reflux.


• Work with a speech-language pathologist or occupational therapist to address sensory-based food aversions.


• Keep a detailed food and symptom diary to identify if specific dietary changes correlate with improved mood or digestion.


• Join the DiseaseMaps.org community to connect with other families sharing their experiences with dietary management.

Medical disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment; always consult your physician or a qualified healthcare provider regarding any dietary changes or health concerns.

References

• Phelan-McDermid Syndrome Foundation (pmsf.org)


• NIH Genetic and Rare Diseases Information Center (GARD) - 22q13 deletion syndrome


• Orphanet: Phelan-McDermid syndrome (ORPHA:2767)


• OMIM (Online Mendelian Inheritance in Man): #606232 (Phelan-McDermid Syndrome)