Asthma
Conditions
Keywords
Asthma, Nutrition, Anti-inflammatory diet
Brief summary
The purpose of this study is to evaluate the effects of a diet that is low in glycemic load and abundant in fiber, fruits, vegetables, legumes and omega-3 fatty acids (anti-inflammatory diet) on pulmonary function in pediatric patients with asthma. The primary endpoint will be change in forced expiratory volume in one second in response to the diet intervention. Secondary outcomes will include additional spirometry measures, fraction of exhaled nitric oxide, and assessment of symptomatic asthma control. In addition, we will identify potential physiological mechanisms relating diet with lung function, including changes in systemic inflammation, insulin sensitivity, and intestinal microbiome composition.
Detailed description
Asthma, an inflammatory disease of the airway mucosa, is highly correlated with obesity and nutritional intake in multiple cross-sectional studies. Limited interventional data in adults with asthma, relying on behavioral modification, have reported that asthma control significantly improves with caloric restriction and diets enriched with antioxidants, and may improve with increasing omega-3 fatty acid content. A comprehensive diet harnessing anti-inflammatory properties of multiple foods may have synergistic effects on bronchial inflammation and pulmonary function, yet this possibility remains largely untested, especially in children. We propose a randomized, controlled cross-over trial, with 6-week treatment arms, in pediatric patients with moderate to severe asthma. The experimental diet will focus on reducing glycemic load, and increasing fiber, fruits, vegetables, legumes and food-based omega-3 fatty acid content. The comparison diet will be each participant's habitual diet. Both diets will be isocaloric and weight maintaining, to isolate the effects of the dietary composition from the known beneficial effects of weight loss. In addition, the home delivery of prepared meals will alleviate the variable and incomplete adherence commonly observed in behavioral studies.
Interventions
The anti-inflammatory diet will focus on reducing glycemic load, and increasing fiber, fruits, vegetables, legumes and food-based omega-3 fatty acid content.
Sponsors
Boston Children's Hospital
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
TREATMENT
Masking
SINGLE (Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
10 Years to 21 Years
Healthy volunteers
No
Inclusion criteria
* Age 10-21 years * Clinical diagnosis of moderate or severe persistent asthma * Currently prescribed inhaled corticosteroids for asthma with anticipated stable dosing regimen for the duration of the study * Admission to Boston Children's Hospital for clinical asthma exacerbation * Medical clearance from primary care provider * Willingness to comply with study diet
Exclusion criteria
* Body mass index (BMI) \< 3rd centile (age- and gender- adjusted normative range from Center for Disease Control) * Known eating disorder * Celiac disease * Any food allergy * Any other major illness as assessed by medical history or the following screening tests: * Alanine aminotransferase (ALT) \> twice upper limit of normal for age * Creatinine \> 1.0 mg/dL for age 10-18 years; \> 1.2 mg/dL for females \> 18 years; or \> 1.4 mg/dL for males \> 18 years) * Random glucose \> 200 mg/dL * Hemoglobin \< 11 g/dL for males age 10-18 years; \< 11. g/dL for females age 10-18 years; \<11.4 g/dL for males \>18 years; or \<10.9 g/dL for females age \> 18 years * Use of systemic steroids for indication other than asthma
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Forced expiratory volume in one second (FEV1) | End of 6-week intervention |
Secondary
| Measure | Time frame |
|---|---|
| Forced expiratory flow 25-75% (FEF25-75) | End of 6-week intervention |
| Fraction of exhaled nitric oxide (FeNO) | End of 6-week intervention |
| Asthma Control Questionnaire (ACQ) | End of 6-week intervention |
| Asthma Control Test (ACT) | End of 6-week intervention |
| Pediatric Asthma-Related Quality of Life Questionnaire | End of 6-week intervention |
| Forced vital capacity (FVC) | End of 6-week intervention |
| Serum inflammatory markers, including C-reactive protein (CRP), erythrocyte sedimentation rate (ESR), tissue necrosis factor-alpha (TNF-alpha), interleukin-6 (IL-6), plasminogen activator inhibitor-1 (PAI-1) | End of 6-week intervention |
| Asthma-related inflammatory markers, including eosinophilic cationic protein (ECP), monocyte chemoattractant protein (MCP-1) | End of 6-week intervention |
| Measures of insulin sensitivity, including fasting glucose, fasting insulin and adiponectin | End of 6-week intervention |
| Intestinal Microbiome Composition, including 16S sequencing and fecal short chain fatty acid levels | End of 6-week intervention |
| Serologic markers of nutritional status, including vitamin D | End of 6-week intervention |
| Asthma medication use | End of 6-week intervention |
Countries
United States
Outcome results
None listed