Carotenoids Linked to Better COPD Breathing

A Baltimore-area study of low-income COPD patients found higher carotenoid levels tracked with better respiratory health and quality of life.

Updated on Nov. 7, 2026 in Asthma

Screen-print poster illustration of carrots, red peppers, and orange slices beside a clear glass vial of amber liquid, with a paper-cut lung silhouette behind. — A Baltimore-area study of low-income COPD patients found higher carotenoid blood levels tracked with better breathing and quality of life in nearly 100 participants. AI Illustration. Upload story photo >

Researchers analyzing data from nearly 100 participants in the CURE COPD study found that people with higher total carotenoid serum levels reported better respiratory health and quality of life. The findings suggest carotenoids, natural compounds that color red, orange and yellow foods, may be linked to how COPD affects patients.

Why it matters

COPD includes emphysema and chronic bronchitis and affects more than 30 million Americans, making it the fourth leading cause of death worldwide. Previous research has found lower carotenoid levels in people with COPD than in those without it, and this study adds evidence connecting those levels to symptom burden.

The analysis compared 10 carotenoid biomarkers with scores on the COPD Assessment Test, the St George's Respiratory Questionnaire, and the Clinical COPD questionnaire across nearly 100 participants. The study does not establish whether carotenoid levels drive respiratory outcomes or simply correlate with them.

The players

Johns Hopkins University

A private research university in Baltimore, Maryland, whose researchers are affiliated with the senior author of the study.

The details

Researchers from the CURE COPD study, which examined low-income people with COPD in the Baltimore area, measured carotenoid serum levels and compared them with participant questionnaire results. Participants with higher total carotenoid levels were less affected by cough and shortness of breath.

Article on the carotenoid study published November 7, 2026.

Health Landscape

The CURE COPD study was originally designed to examine how nutrition and air pollution affect low-income patients in Baltimore, and this carotenoid analysis extends that work to a specific nutrient biomarker. Carotenoid research in COPD builds on earlier findings that patients have lower serum levels than people without the disease.

Carotenoids come from red, orange and yellow foods such as carrots, tomatoes and leafy greens, so the findings point to diet as a factor patients may discuss with their clinicians. The study does not establish that eating more of these foods will improve COPD symptoms.

The takeaway

Higher carotenoid levels were associated with better breathing and quality of life in this group of COPD patients. Anyone managing COPD should talk with their healthcare provider before making dietary changes.