Why does mint feel cold? Scientists reveal the brain trick behind menthol’s chill

Ever wondered why mint feels icy cold even when it isn’t? Scientists have now captured the first close-up images of the body’s “cold sensor,” revealing how menthol tricks the brain into sensing a drop in temperature. (Image: Pinterest)

• Scientists capture first close-up images of body's cold sensor
• Mint tricks the brain by activating the TRPM8 cold sensor protein
• Understanding TRPM8 may help treat chronic pain and migraines

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Have you ever slipped a mint into your mouth and felt a sudden icy whisper spread across your tongue, as though a tiny gust of winter had  wandered in? For decades, scientists have wondered how the body produces this feeling. Now, researchers have finally captured the first close-up images of the body’s microscopic “cold sensor”, revealing how it works, and how mint cleverly fools it.

Deep within the membranes of certain sensory nerve cells lies a protein channel called TRPM8. Scientists often describe it as the body’s internal thermometer.

When the temperature around you drops into a cooler range, roughly between 8 degree Celsius and 28 degree Celsius, this tiny channel opens. Once open, it allows charged particles known as ions to flow into the nerve cell. That electrical activity travels rapidly through the nervous system until it reaches the brain. The brain then interprets the signal as one simple message: cold.

These sensors are found in nerve endings in the skin, the mouth and even the eyes, which explains why a frosty wind or a cooling mint can both trigger a similar response.

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Here’s how how mint tricks the brain

Menthol, the compound responsible for mint’s fresh taste, does not actually lower temperature. Instead, it binds to a particular spot on the TRPM8 channel. Once attached, menthol nudges the channel open in almost exactly the same way as cold air would. To the brain, the signal looks identical to the one produced by a real drop in temperature. In other words, mint performs a neat sensory illusion. Nothing has frozen, but your nervous system thinks it has.

Freezing proteins to see the invisible

To uncover the mechanism, scientists used cryo-electron microscopy, a technique that allows proteins to be rapidly frozen and examined with powerful electron beams.

By capturing multiple snapshots of TRPM8 in different states, the researchers could watch the protein change shape as it switched from closed to open.

The images revealed two distinct activation routes

• Cold temperatures reshape the central pore of the protein, opening a gateway for ions.
• Menthol molecules bind to another section, triggering structural shifts that eventually open the same gateway.
• Cold and menthol together produce an even stronger response, making the channel open more easily.

This combined effect helped scientists capture the channel fully open, something that had not been possible before.

Understanding the cold sensor is more than a scientific curiosity. Faults in the TRPM8 pathway have been linked to several medical conditions, including chronic pain, migraines and dry eye disease. By mapping how the protein works, researchers now have a clearer target for designing treatments. Some therapies already tap into this pathway. For example, certain medicated eye drops use menthol-like compounds to stimulate tear production and soothe irritation.

The new images also revealed a previously unknown “cold spot” within the protein, a key region that helps maintain its sensitivity during prolonged exposure to low temperatures. For years, biologists suspected that the sensations of cold and mint were connected at the molecular level. What they lacked was visual proof.

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Now, for the first time, scientists can see precisely how the same microscopic switch responds to both winter air and minty compounds.

The result is a clearer understanding of one of the body’s most familiar sensations, that sudden, refreshing chill that arrives whether you step outside on a frosty morning or simply unwrap a mint.

FAQs on Cold Sensors and Brain Functioning

1. What are cold sensors?

Cold sensors are protein channels in sensory nerve cells that detect changes in temperature and send signals to the brain indicating cold sensations.

2. How do cold sensors work?

Cold sensors like TRPM8 open when temperatures drop, allowing ions to flow into nerve cells. This electrical activity travels to the brain, which interprets it as cold.

3. How does mint trick the brain into feeling cold?

Menthol in mint binds to TRPM8 channels, nudging them open just like cold air does. The brain interprets this activity as a drop in temperature, creating a sensation of cold.

4. Why is understanding cold sensors important?

Faults in cold sensors are linked to conditions like chronic pain and migraines. Understanding them helps in designing targeted treatments for these conditions.

Disclaimer: This article, including health and fitness advice, only provides generic information. Don’t treat it as a substitute for qualified medical opinion. Always consult a specialist for specific health diagnosis