Monosodium glutamate
Score impact
-0.50
points/product
Description
Monosodium glutamate (E621) is a food additive classified as a flavor enhancer. It is the sodium salt of glutamic acid, a non-essential amino acid naturally present in many foods such as tomatoes, cheeses, mushrooms, and seaweed. Its main function is to enhance the umami taste, the fifth basic taste, providing a sensation of fullness and roundness in flavor.
Industrially, E621 is mainly obtained by bacterial fermentation of sugar cane or beet molasses, corn starch, or cassava, using strains of Corynebacterium glutamicum. This process is similar to that of other amino acids and is considered natural. It can also be obtained by protein hydrolysis, but fermentation is the most common and efficient method.
From a physicochemical point of view, monosodium glutamate is a white crystalline powder, odorless, with a characteristic taste. It is highly soluble in water and stable at normal cooking temperatures. Its pH in aqueous solution is approximately 7.0.
The use of monosodium glutamate as a flavor enhancer dates back to the early 20th century, when Japanese chemist Kikunae Ikeda isolated glutamic acid from kombu (seaweed) and discovered its ability to improve flavor. In the European Union, it was authorized as a food additive after safety evaluations. The European Food Safety Authority (EFSA) has re-evaluated E621 several times, most recently in 2017, establishing an Acceptable Daily Intake (ADI) of 30 mg/kg body weight per day. The World Health Organization (WHO) and FAO, through the Joint FAO/WHO Expert Committee on Food Additives (JECFA), have also evaluated its safety and set an ADI of 30 mg/kg/day, considering it safe for the general population.
Regarding the overall safety assessment, E621 is considered safe for human consumption in the amounts commonly used in food. It has not been shown to cause serious adverse effects in most people, although there is controversy about glutamate sensitivity, known as 'Chinese restaurant syndrome', which includes symptoms such as headache, sweating, and palpitations in some sensitive individuals. However, controlled studies have not been able to confirm a consistent causal relationship. EFSA concludes that there is no evidence that monosodium glutamate poses a health risk under authorized conditions of use.
In food labeling, E621 must appear in the ingredient list with its name or E number. It is mandatory to indicate 'flavor enhancer: monosodium glutamate' or 'E621'. Consumers can easily identify it in processed products such as soups, sauces, snacks, prepared dishes, and seasonings.
Monosodium glutamate (E621) is mainly used as a flavor enhancer in a wide variety of processed foods. According to Regulation EC 1333/2008, it is authorized in numerous food categories, such as soups and broths, sauces (including soy sauce, ketchup, mayonnaise), savory snacks (potato chips, seasoned nuts), prepared dishes (frozen meals, pizzas), seasonings and dressings, processed meat products (sausages, frankfurters), and snack products.
In Spain, it is commonly found in brands such as Gallina Blanca (soups and broths), Knorr (soups and sauces), Lays (potato chips), and in many private label products. Authorized limits vary by category, but generally up to 10 g/kg (1%) is allowed in most foods, although in some cases such as seasonings it can reach 20 g/kg. In comparison with the US FDA, E621 is classified as 'generally recognized as safe' (GRAS) and has no specific limits, only good manufacturing practices. In Japan, where umami is highly valued, its use is extensive and also regulated without specific limits.
The ADI established by EFSA and JECFA is 30 mg/kg body weight per day, equivalent to about 2.1 g for a 70 kg person, an amount well above the estimated average intake in the European diet (around 0.3-1 g/day).
The side effects of monosodium glutamate (E621) have been debated for decades. The term 'Chinese restaurant syndrome' was coined in the 1960s to describe symptoms such as headache, sweating, facial flushing, palpitations, and numbness after consuming foods high in glutamate. However, numerous placebo-controlled studies have failed to demonstrate a consistent causal relationship.
EFSA, in its 2017 re-evaluation, concluded that there is no evidence that monosodium glutamate causes adverse effects in the general population at usual doses. Nevertheless, it is recognized that some people may be sensitive and experience mild, transient symptoms after consuming large amounts (more than 3 g in a single meal).
The proposed biological mechanism involves stimulation of glutamate receptors in the nervous system, but the blood-brain barrier limits the passage of blood glutamate into the brain. Sensitive populations include people with severe asthma (it has been suggested that it could trigger attacks in some cases, although evidence is weak) and those with celiac disease or gluten sensitivity, as some glutamate-containing products may contain traces of gluten.
No significant interactions with medications have been documented. WHO and EFSA consider E621 safe and do not establish special restrictions for vulnerable groups, except that it should be avoided in foods for infants and young children as a precaution.
In summary, for most people, monosodium glutamate does not pose a health risk when consumed within established limits.
- Sodium glutamate
- MSG
- L-glutamic acid monosodium salt
- Monosodium glutamate anhydrous
Products in our Spanish database containing this additive
Examples found in ComerClaro Spanish product database
Product names and supermarket data may appear in Spanish.
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