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The effect of conjugated linoleic acid supplementation on the nutritional status of COPD patients

Authors Ghobadi H, Matin S, Nemati A, Naghizadeh-baghi A

Received 28 April 2016

Accepted for publication 25 July 2016

Published 31 October 2016 Volume 2016:11(1) Pages 2711—2720

DOI https://doi.org/10.2147/COPD.S111629

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Charles Downs

Peer reviewer comments 3

Editor who approved publication: Dr Richard Russell


Hassan Ghobadi,1 Somaieh Matin,2 Ali Nemati,3 Abbas Naghizadeh-baghi4

1Pulmonary Division, 2Internal Medicine Department, 3Biochemistry and Nutrition Department, 4Basic Sciences Department, Ardabil University of Medical Sciences, Ardabil, Iran

Background: COPD patients are susceptible to anorexia, reduction of caloric intake, weight loss, and malnutrition. One of the possible mechanisms is the increase of inflammatory markers such as interleukin 1β (IL), is highly correlated with anorexia. Considering the anti-inflammatory role of conjugated linoleic acid (CLA), this study aimed to investigate the effect of CLA supplementation on the nutritional status of COPD patients.
Patients and methods: In a double-blind clinical trial, 93 COPD patients who volunteered to participate in the study and who filled out a written consent form, were randomly assigned to control or supplementation groups. The patients in the supplementation group received 3.2 g of CLA on a daily basis for 6 weeks, while those in the control group received placebo on a daily basis for 6 weeks. For IL assessment, the patients’ anthropometric indices and appetite score were checked and their blood samples were collected both before and after the treatment. Moreover, in order to investigate the changes in the caloric intake trend during the study, their dietary intake levels were assessed using 24-hour dietary recall, 3 days a week at the onset, in the 4th week, and at the end of the study. Eventually, 90 patients completed the study.
Results: The results demonstrated a significant increase in appetite score (P=0.001), average caloric intake (P=0.01), and macronutrient intake (P<0.05), while a significant decrease was observed in the serum level of IL among the patients of the supplementation group (P=0.008). Meanwhile, although the supplementation group’s body mass index was also higher on completion, compared to their own initial state as well as to that in the control group, the differences were not significant (P=0.13).
Conclusion: The findings of this research indicate that the consumption of CLA supplementation can be effective in regulating the appetite and improving the nutritional status of patients suffering from COPD through adjusting the serum level of IL.

Keywords: COPD, CLA, appetite, nutritional status, IL

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