Gastrointestinal Response of Pediatric Cystic Fibrosis Patients on Mediterranean Diet

Inclusion Criteria: * Male and female pediatric patient with cystic fibrosis age 3 and older * Nutritional status defined as a BMI Z-score of at least -1 or above * Confirm diagnosis of CF defined by 2 CF causing mutations on genetic testing or sweat chloride greater than 60 mEq/L * Children with pancreatic insufficient CF and on PERT * Children with pancreatic sufficient CF not on PERT * Child must be on a full, solids based diet * Family willing to child adhere to an exclusive Mediterranean style diet for a period of 6 months * Child must be able to follow-up at regular CF clinic visits and attend any additional study visits if necessary Exclusion Criteria: * Children with malnutrition * Children who require nutritional supplementation via any type of feeding tube * Children with poorly controlled CF lung disease * Children with advanced CF liver disease * Children with a comorbid gastrointestinal disease such as celiac disease, Crohn's disease or other malabsorptive process to be reviewed by PI * Children with significant food allergies or other gastrointestinal allergy * Family is unwilling to adhere to prescribed dietary intervention