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The impact of rice bran oil consumption on the serum lipid profile in adults: a systematic review and meta-analysis of randomized controlled trials.

  • 2021-03-10
  • Critical reviews in food science and nutrition 62(22)
    • Behnaz Pourrajab
    • Mohammad Hassan Sohouli
    • Ali Amirinejad
    • Somaye Fatahi
    • Mihnea-Alexandru Găman
    • Farzad Shidfar

Study Design

Type
Meta-Analysis
Methods
Systematic search of multiple databases until October 7, 2020; meta-analysis of 8 eligible trials with 14 effect sizes
Funding
Unclear
Dyslipidemia/hyperlipidemia is recognized among the risk factors for lifestyle related diseases. A healthy diet, rich in vegetable oils such as rice bran oil (RBO), may aid to improve serum lipid levels. Thus, the aim of this study was to assess the effects of rice bran oil (RBO) consumption on serum total cholesterol (TC), low-density lipoprotein cholesterol (LDL-c), high-density lipoprotein cholesterol (HDL-c) and triglyceride (TG) levels in adults. The following online databases were searched for manuscripts published until October 7th 2020: PubMed/Medline, Scopus, Clarivate Analytics' Web of Science, Cochrane Central Register of Controlled Trials, and Google Scholar. The effect sizes were expressed as weighted mean difference (WMD) with 95% confidence intervals (CI). A total of 8 eligible trials with 14 effect sizes were included in this meta-analysis. Our analysis revealed that the consumption of RBO significantly decreased serum TC (WMD: -7.29 mg/dL, 95% CI: -11.32, -3.25, P = 0.000), LDL-c (WMD: -7.62 mg/dL, 95% CI: -11.10, -4.14, P = 0.000) and TG (WMD: -9.19 mg/dL, 95% CI: -17.99, -0.38, P = 0.041) levels. So, available evidence suggests that RBO consumption can significantly decrease serum TC, LDL-c and TG levels. Hence, it may play a role in reducing dyslipidemia/hyperlipidemia risk.

Research Insights

  • rice bran→Increased HDL Cholesterol

    The abstract does not report a significant effect on HDL-c (HDL-c is mentioned as one of the outcomes assessed but no significant change is reported).

    Effect
    Neutral
    Effect size
    Small
    Dose
    not stated
  • rice bran→Reduced Blood Cholesterol

    Our analysis revealed that the consumption of RBO significantly decreased serum TC (WMD: -7.29 mg/dL, 95% CI: -11.32, -3.25, P = 0.000)

    Effect
    Beneficial
    Effect size
    Small
    Dose
    not stated
  • rice bran→Reduced LDL Cholesterol

    Our analysis revealed that the consumption of RBO significantly decreased serum ... LDL-c (WMD: -7.62 mg/dL, 95% CI: -11.10, -4.14, P = 0.000)

    Effect
    Beneficial
    Effect size
    Small
    Dose
    not stated
  • rice bran→Reduced Triglyceride Levels

    Our analysis revealed that the consumption of RBO significantly decreased ... TG (WMD: -9.19 mg/dL, 95% CI: -17.99, -0.38, P = 0.041) levels.

    Effect
    Beneficial
    Effect size
    Small
    Dose
    not stated
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