Update on food safety of monosodium l-glutamate (MSG)
1Department of Human Nutrition and Dietetics, College of Applied Food Sciences and Tourism, Michael Okpara University of Agriculture, Umudike, P.M.B 7267 Umuahia, Abia State, Nigeria.
Objective:
This evidence-based safety review of the flavor enhancer monosodium l-glutamate (MSG) was triggered by its global use and recent studies expressing some safety concerns.
Methodology:
This article obtained information through search of evidence-based scientific databases, especially the US National Library of Medicine NIH.
Results:
(A) MSG is a water-soluble salt of glutamate, a non-essential amino acid, normally synthesized in the body and prevalent in protein foods. (B) MSG is utilized world-wide for its "umami" taste and flavor enhancement qualities, (C) the human body does not discriminate between glutamate present in food and that added as seasoning, (D) glutamate metabolism is compartmentalized in the human body without reported ethnic differences, (E) glutamate does not passively cross biological membranes, (F) food glutamate is completely metabolized by gut cells as energy source and serves as key substrate for other important metabolites in the liver, (G) normal food use of MSG is dose-dependent and self-limiting without elevation in plasma glutamate, (H) the recent EFSA acceptable daily intake (30mg/kg body weight/day) is not attainable when MSG is consumed at normal dietary level, (I) scientists have not been able to consistently elicit reactions in double-blind studies with 'sensitive' individuals using MSG or placebo in food.
Conclusion:
Based on the above observations (A-I), high quality MSG is safe for all life-cycle stages without respect to ethnic origin or culinary background. MSG researchers are advised to employ appropriate scientific methodologies, consider glutamate metabolism and its normal food use before extrapolating pharmacological rodent studies to humans.
Insights
Monosodium l-glutamate (MSG) is a safe flavor enhancer for all life stages. Scientific evidence shows the human body metabolizes MSG similarly to naturally occurring glutamate, with no adverse effects at normal dietary levels.
Area of Science:
- Food Science
- Toxicology
- Human Nutrition
Background:
- Monosodium l-glutamate (MSG) is a widely used global flavor enhancer.
- Recent studies have raised questions regarding MSG safety.
- This review addresses safety concerns associated with MSG consumption.
Purpose of the Study:
- To conduct an evidence-based safety review of monosodium l-glutamate (MSG).
- To evaluate recent safety concerns surrounding MSG's global use.
Main Methods:
- Searched evidence-based scientific databases, including the US National Library of Medicine.
- Reviewed scientific literature on MSG metabolism, safety, and human studies.
Main Results:
- MSG is a salt of glutamate, an amino acid naturally synthesized in the body.
- The human body metabolizes dietary glutamate identically, regardless of source.
- MSG consumption at normal dietary levels is dose-dependent, self-limiting, and does not elevate plasma glutamate.
- Double-blind studies failed to consistently elicit reactions in sensitive individuals.
- The European Food Safety Authority's (EFSA) acceptable daily intake is not reached with normal MSG consumption.
Conclusions:
- High-quality MSG is safe for consumption across all life stages and ethnic backgrounds.
- Researchers should use appropriate methodologies and consider human metabolism when evaluating MSG safety.
- Extrapolation of rodent studies to humans requires careful consideration of dosage and metabolic differences.
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