Effects of flaxseed supplementation on weight loss, lipid profiles, glucose, and high‐sensitivity C‐reactive protein in patients with coronary artery disease: A systematic review and meta‐analysis of randomized controlled trials

Abstract

AbstractThis meta‐analysis aimed to evaluate the effects of flaxseed supplementation on weight loss, lipid profiles, high‐sensitivity C‐reactive protein (hs‐CRP), and glucose levels in patients with coronary artery disease (CAD). A systematic search was performed using various online databases, including Scopus, PubMed, Web of Science, EMBASE, and Cochrane Library, to identify relevant randomized controlled trials (RCTs) until June 2023. To evaluate heterogeneity among the selected studies, the Q‐test and I2 statistics were employed. Data were combined using either a fixed‐ or random‐effects model and presented as a weighted mean difference (WMD) with a 95% confidence interval (CI). Of the 428 citations, six RCTs were included. The pooled results did not show significant changes in the WMD of lipid factors (high‐density lipoprotein cholesterol, triglycerides (TG), low‐density lipoprotein cholesterol, and total cholesterol) following flaxseed intake. However, after performing a sensitivity analysis to determine the source of heterogeneity, flaxseed supplementation resulted in a significant decrease in TG levels (WMD = −18.39 mg/dL; 95% CI: −35.02, −1.75). Moreover, no significant differences were observed in either weight or BMI following flaxseed intake. However, the circulating levels of fasting blood glucose (WMD = −8.35 mg/dL; 95% CI: −15.01, −1.69, p = .01) and hs‐CRP (WMD = −1.35 mg/L; 95% CI: −1.93, −0.77, p < .01) significantly decreased after the intervention. Flaxseed supplementation was associated with lowering FBS, hs‐CRP, and TG levels but did not affect weight loss parameters and other lipid markers in CAD.