“MSG is bad for you.”

The widespread misconception about monosodium glutamate, or MSG, largely traces its roots back to a single, speculative letter published in the New England Journal of Medicine in 1968. In this letter, a doctor described experiencing symptoms like numbness and weakness after eating at a Chinese restaurant and theorized that MSG, among other ingredients, might be the cause. This quickly led to the coining of the term "Chinese Restaurant Syndrome," which gained significant traction in the media, fueled by sensational headlines and, unfortunately, existing anti-Asian sentiment. This initial spark ignited decades of misunderstanding and stigma around the common flavor enhancer.

Despite the early concerns, extensive scientific research has since debunked the notion that MSG is inherently bad for you. Monosodium glutamate is simply the salt of glutamic acid, an amino acid naturally found in many foods like tomatoes, cheese, and mushrooms, contributing to the savory taste known as umami. Major food safety organizations worldwide, including the U.S. Food and Drug Administration (FDA), the Joint FAO/WHO Expert Committee on Food Additives (JECFA), and the European Food Safety Authority (EFSA), have consistently classified MSG as "generally recognized as safe" (GRAS) for consumption in typical amounts. Rigorous, controlled studies have largely failed to consistently replicate the symptoms attributed to MSG, and our bodies metabolize the glutamate from MSG in the same way they do naturally occurring glutamate. While a small subset of individuals might experience mild, temporary sensitivities to very large doses of MSG, particularly on an empty stomach, these reactions are rare and not considered harmful for most people.

The enduring belief that MSG is unhealthy persists for several reasons. The initial media frenzy surrounding "Chinese Restaurant Syndrome" created a powerful narrative that was difficult to dislodge, even as scientific consensus shifted. Early, often flawed, studies contributed to the misconception, and the term itself became deeply ingrained in public consciousness, even appearing in dictionaries. Furthermore, restaurants' efforts to appease wary customers by advertising "No MSG" inadvertently reinforced the idea that the ingredient was harmful. Personal anecdotal experiences, which can sometimes be attributed to other factors like overeating or the psychological expectation of symptoms, also continue to fuel the myth, despite overwhelming scientific evidence to the contrary.