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Antiobesity effects of onion (Allium cepa) in subjects with obesity: Systematic review and meta-analysis.

  • 2023-05-16
  • Food science & nutrition 11(8)

Study Design

Type
Review
Sample size
n = 38
Population
obese subjects
Methods
Systematic review and meta-analysis; studies identified in PubMed/MEDLINE, Embase, Web of Science, and CENTRAL focusing on clinical trials evaluating the antiobesity effects of onion in obese subjects; risk of bias evaluated using Cochrane's Risk of Bias tool; effect analyzed using weighted mean difference with 95% CI; I² test for heterogeneity
Onions are rich in bioactive compounds and have been found to prevent various chronic diseases, including obesity. We performed a systematic review and meta-analysis to investigate the antiobesity effect of onions. Studies were identified in PubMed/MEDLINE, Embase, Web of Science, and CENTRAL focusing on clinical trials evaluating the antiobesity effects of onion in obese subjects. The risk of bias in the studies was evaluated using Cochrane's Risk of Bias tool. The effect of onions was analyzed using data from the selected studies, and the results were indicated by weighted mean difference with 95% CI. The I2 static test was used to examine heterogeneity between the studies. A total of 38 studies were reviewed, of which five clinical trials meeting the criteria were selected. As investigational products, onion peels were used in four studies and onions were used in one study. Following systematic review, it was determined that the risk of bias was generally low, and body weight, BMI, waist circumference, and triglyceride levels were significantly reduced in the onion groups compared to the placebo. In conclusion, onion intake had an antiobesity effect by reducing body weight and body fat, and this effect was particularly pronounced with onion peel.

Research Insights

  • onion→Reduced Body Mass Index

    body weight, BMI, waist circumference, and triglyceride levels were significantly reduced in the onion groups compared to the placebo.

    Effect
    Beneficial
    Effect size
    Small
  • onion→Reduced Body Weight

    body weight, BMI, waist circumference, and triglyceride levels were significantly reduced in the onion groups compared to the placebo.

    Effect
    Beneficial
    Effect size
    Small
  • onion→Reduced Triglyceride Levels

    body weight, BMI, waist circumference, and triglyceride levels were significantly reduced in the onion groups compared to the placebo.

    Effect
    Beneficial
    Effect size
    Small
  • onion→Reduced Waist Circumference

    body weight, BMI, waist circumference, and triglyceride levels were significantly reduced in the onion groups compared to the placebo.

    Effect
    Beneficial
    Effect size
    Small
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