International Journal of COPD (Nov 2021)
Effects of Nutritional Interventions in Individuals with Chronic Obstructive Lung Disease: A Systematic Review of Randomized Controlled Trials
Abstract
Einar Furulund,1– 3 Mitra Bemanian,2,3 Nina Berggren,3 Tesfaye Madebo,2,4 Sara Hydle Rivedal,3 Torgeir Gilje Lid,1,5 Lars Thore Fadnes2,3 1Centre for Alcohol and Drug Research, Stavanger University Hospital, Stavanger, Norway; 2Bergen Addiction Research, Department of Addiction Medicine, Haukeland University Hospital, Bergen, Norway; 3Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway; 4Department of Respiratory Medicine, Stavanger University Hospital, Stavanger, Norway; 5Department of Public Health, University of Stavanger, Stavanger, NorwayCorrespondence: Einar FurulundCentre for Alcohol and Drug Research, Stavanger University Hospital, Stavanger, NorwayTel +4751518000Email [email protected]: The role of nutrition and dietary patterns has been widely investigated in cancer, cardiovascular disease, and diabetes, but there are limited data on nutritional impact on COPD. This systematic review (PROSPERO-reg. no: CRD42020172712) aimed to investigate the effect of nutritional interventions on pulmonary and physical function, inflammation, and health-related quality of life among individuals with COPD.Methods: Systematic searches were conducted in Medline, Embase, and Cochrane, resulting in 3861 references. Studies focusing exclusively on inpatient-stays, underweight or obese patients were excluded. Double screening, extraction and bias assessment were conducted. Bias was assessed according to the Cochrane risk of bias tool for randomized controlled trials. Thirteen randomized controlled trials with 916 participants were included.Results: These trials investigated effects of protein supplementation, beetroot juice, increased fruit and vegetable intake, black seed oil, Tualang honey, Chlorella vulgaris-extract, whey-peptide containing nutritional drink, and increased macronutrient intake. The durations of the interventions were from weeks to a few months, and only one with duration > 1 year (investigating increased fruit/vegetable intake). The intervention increasing fruit/vegetables found improvement in pulmonary function tests. Some interventions observed effects on systemic inflammation, health-related quality of life and physical function, although with some mixed results. Five were classified as poor, five as fair, and three as good in terms of risk of bias and quality.Conclusion: Increasing intake of fruits and vegetables over prolonged periods might have positive effects on lung function in individuals with COPD. Some nutritional interventions also observed effects on systemic inflammation, health-related quality of life, and physical function, although with some mixed results. Many of the trials were underpowered, had high dropout rates, or had a high risk of bias. Further research should investigate effect of prolonged dietary interventions.Keywords: nutrition, lung function, inflammation, physical function, health-related quality of life
