Clinical Research Directory

Inclusion Criteria: * Inclusion Criteria: * Diagnosis of COPD with no exacerbation episodes in the last 3 months * Aged 18 to 75 years * Patient at the Interstitial Lung Diseases Outpatient Clinic of Hospital das Clínicas da UFMG * Ability to perform spirometry * Ability to perform the 6-minute walk test (6MWT) * Willingness to participate in the study and signed Informed Consent Form (ICF) * Ability to read and write * Daily dietary fiber intake between 10 and 20 grams Exclusion Criteria: * End-stage COPD (GOLD stage 4) * Primary diagnosis of asthma * Interstitial lung disease * Lung transplant recipients * Severe comorbidities impacting outcomes (severe pancreatic, hepatic, renal, or cardiac disease; inflammatory bowel disease; active neoplasm with prognostic impact; human immunodeficiency virus/AIDS; active pulmonary tuberculosis; multiple sclerosis) * Any other condition identified during the screening visit by the investigator or nurse that could interfere with the study or patient safety * Diagnosed COPD exacerbation (ECOPD) within the 3 months prior to study start * Recent acute respiratory infection * Unwillingness or inability to comply with study procedures (e.g., inability to record dietary intake, attend visits, or manage oral supplementation) * Pregnant, breastfeeding, or planning to become pregnant * Change in smoking habits within the last 6 months * Major changes in COPD maintenance therapy within 3 months prior to screening * Requirement for other nutritional supplements or parenteral nutrition * Daily dietary fiber intake exceeding 28 grams for women or 34 grams for men * Use of a short course of oral corticosteroids within 4 weeks prior to Day 1 of the study