MSG Did Nothing Wrong

Better Living Through Undeserved Reputation Chemistry, Part I

Image coutesy of DALLE-3.

Everyone already “knows” about MSG.

It causes headaches.

Or it doesn’t.

It’s bad for you.

Or it’s fine.

It’s artificial.

Or it’s natural.

It’s everywhere.

Or it’s a lie made up by Big Takeaway.

Depending on who you ask, monosodium glutamate is either a culinary demon or a harmless seasoning unfairly maligned by decades of xenophobic panic.

And here’s the uncomfortable truth:

Most people are wrong — including the ones who are right.

Let’s start at the beginning.

What MSG Actually Is (Brace Yourself)

Monosodium glutamate is the sodium salt of glutamic acid.

That’s it.

That’s the scandal.

Glutamic acid is one of the most common amino acids in nature. It’s a building block of proteins. It occurs naturally in tomatoes, cheese, mushrooms, seaweed, breast milk, and — inconveniently for the narrative — in you.

Your body uses glutamate constantly. Your brain, in particular, is extremely fond of it. It’s one of the primary neurotransmitters involved in normal neural signaling.

If MSG were intrinsically “toxic,” you would have noticed by now.

So Why Does It Taste So Good?

MSG activates umami — the savory taste.

Umami is not a trick. It’s not a chemical hack. It’s one of the five basic tastes, alongside sweet, sour, salty, and bitter. Humans evolved receptors for it because it signals the presence of protein-rich food.

In other words, your enjoyment of MSG is not a flaw in your willpower.

It’s a feature.

The Myth of ‘Chinese Restaurant Syndrome’

The modern fear of MSG traces back to a 1960s letter to a medical journal, in which a doctor speculated — without controlled evidence — that he felt unwell after eating Chinese food.

• This idea was picked up, exaggerated, and quietly fused with cultural anxieties about “foreign” cuisine.
• Subsequent controlled studies?
• They failed to replicate the effects.
• Double-blind trials repeatedly show that people who believe they are sensitive to MSG cannot reliably tell whether they’ve consumed it — unless they know it’s there.

- The symptoms are real.

- The cause is not.

This is a nocebo effect: expectation shaping experience.

Your brain is astonishingly cooperative when it comes to proving itself right.

But Some People Really Do Feel Bad After Eating It

Yes.

Some people feel bad after eating foods high in MSG.

Some people also feel bad after eating:

• cheese
• tomatoes
• mushrooms
• cured meats

These foods contain naturally occurring glutamates.

We don’t panic about those.

Because panic, it turns out, is selective.

Why MSG Became the Villain

MSG didn’t become infamous because of chemistry.

It became infamous because it was:

unfamiliar

associated with immigrant food

described using a chemical-sounding name

introduced at exactly the moment Western culture began equating “natural” with “safe”

MSG was never uniquely dangerous.

It was just narratively convenient.

The Real Lesson Here

• MSG is not a miracle ingredient.
• It’s not poison.
• It’s not a conspiracy.
• It’s a molecule doing exactly what molecules do.

The interesting part is not what MSG does to your body — it’s what the idea of MSG does to your mind.

Because once you see how easily a harmless compound can be turned into a villain, you start to notice how often we do this.

• To preservatives.
• To additives.
• To entire categories of chemistry.

And suddenly, the fear stops looking scientific at all.

It starts looking cultural.

Where This Leaves Us

If MSG taught us anything, it’s this:

- We are very good at inventing chemical monsters.

- We are very bad at checking whether they’re real.

Next time, we’ll look at another compound with a truly astonishing reputation — one that people insist they’re “avoiding” despite encountering it constantly.

Until then, enjoy your dinner.

xoxo, Claudia

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