Poor carbohydrate quality is associated with impaired lung function: A population-based cross-sectional analysis
1Department of Thoracic Surgery, Gongli Hospital of Shanghai Pudong New Area, Shanghai, China.
Medicine
|June 16, 2026
Summary
Poor carbohydrate quality, measured by a high carbohydrate-to-fiber ratio, is linked to reduced lung function in US adults. Increasing dietary fiber may support respiratory health.
Area of Science:
- Nutrition Science
- Pulmonology
- Public Health
Background:
- Dietary carbohydrate quality is a potential determinant of lung function.
- Existing population-based evidence on this link is limited.
- The carbohydrate-to-fiber (CH:Fiber) ratio serves as a metric for carbohydrate quality.
Purpose of the Study:
- To investigate the association between carbohydrate quality (CH:Fiber ratio) and pulmonary function in a representative sample of U.S. adults.
- To explore potential effect modification by age, smoking status, and history of chronic bronchitis.
Main Methods:
- Analysis of data from 11,414 U.S. adults (≥18 years) from the National Health and Nutrition Examination Survey (2007-2012).
- Dietary intake assessed via 24-hour recalls; CH:Fiber ratio calculated.
- Lung function measured using spirometry (FEV1, FVC, etc.).
- Multivariable linear regression models used for analysis, including subgroup and interaction analyses.
Main Results:
- A higher CH:Fiber ratio was significantly associated with lower forced vital capacity (FVC) and forced expiratory volume in 1 second (FEV1).
- Associations were directionally consistent for other lung function measures, though weaker.
- Inverse associations were more pronounced in older adults, current smokers, and individuals with chronic bronchitis.
Conclusions:
- Poor carbohydrate quality, indicated by a high CH:Fiber ratio, is independently associated with diminished lung function in U.S. adults.
- Dietary patterns emphasizing fiber-rich carbohydrate sources may benefit respiratory health.
- Further research, including prospective studies and intervention trials, is warranted to establish causality and understand underlying biological mechanisms.
Related Concept Videos
01:24Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features
Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...
01:27Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies
Assessing and diagnosing Chronic Obstructive Pulmonary Disease (COPD) involves a detailed approach that includes a comprehensive review of medical history, physical examination, and a variety of diagnostic tests. This thorough evaluation is essential to ensure an accurate diagnosis and guide effective management strategies.
Medical History
Medical History
01:23Chronic Obstructive Pulmonary Disease I: Introduction
Chronic obstructive pulmonary disease is a common, preventable, and treatable respiratory disorder characterized by persistent symptoms and progressive airflow limitation. This limitation results from a combination of small-airway disease (obstructive bronchiolitis) and parenchymal destruction (emphysema), both driven by chronic inflammation from exposure to harmful particles or gases.The disease includes two main pathological entities: emphysema, marked by destruction of alveolar walls and...
01:20COPD: Pathogenesis and Clinical Features
Chronic obstructive pulmonary disease (COPD) is a group of lung conditions that progressively worsen over time, including chronic bronchitis and emphysema. This cluster of diseases collectively leads to a gradual and irreversible decline in lung function over time.
The primary cause for the onset of COPD is cigarette smoking and exposure to air pollution. These hazardous factors initiate a chain reaction within the lungs, resulting in chronic inflammation, damage to the airways, and a...
The primary cause for the onset of COPD is cigarette smoking and exposure to air pollution. These hazardous factors initiate a chain reaction within the lungs, resulting in chronic inflammation, damage to the airways, and a...
01:25Pulmonary Function Tests
Pulmonary Function Tests (PFTs)
Pulmonary Function Tests are crucial diagnostic tools for assessing respiratory function, particularly in patients with chronic respiratory disorders. They comprehensively evaluate lung volumes, ventilatory function, breathing mechanics, diffusion, and gas exchange. These tests help diagnose pulmonary diseases and play a significant role in monitoring disease progression, evaluating disability, and assessing response to therapy.
PFTs involve using a spirometer, a...
Pulmonary Function Tests are crucial diagnostic tools for assessing respiratory function, particularly in patients with chronic respiratory disorders. They comprehensively evaluate lung volumes, ventilatory function, breathing mechanics, diffusion, and gas exchange. These tests help diagnose pulmonary diseases and play a significant role in monitoring disease progression, evaluating disability, and assessing response to therapy.
PFTs involve using a spirometer, a...
01:20Chronic Obstructive Pulmonary Disease-II: Pathophysiology
Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
Chronic Inflammation
Chronic Inflammation