Coke Has More Caffeine Than You Think – Food Myths Debunked

Ever wondered which everyday drink gives you the biggest jolt? It turns out your go-to soda might be more of a stimulant than you ever imagined. In a recent episode of Discovery Channel’s “Food Detectives,” researchers put common beverages to the test to uncover how much caffeine—and other surprising effects—they really pack. The results may make you rethink your afternoon pick-me-up.

The short answer? One standard 12oz aluminum can of cola contains around 300mg of caffeine. That’s roughly double the amount in two average 8oz cups of coffee—or the equivalent of six shots of espresso. Surprised? You’re not alone.

Caffeine Showdown: Tea, Coffee, and Cola

To settle the debate over which beverage delivers the most caffeine, the show’s host consulted a science magazine editor. They compared equal 8oz servings of green tea, black tea, and coffee. Green tea came in lowest at 30mg, black tea at 50mg, and regular brewed coffee at 150mg. But those numbers pale next to cola’s hidden dose.

A typical 12oz cola can holds about 300mg of caffeine. That single serving outweighs the caffeine in two full cups of coffee, six espressos (about 30–50mg each), or even 30 chocolate bars. The “Food Detectives” revealed cola as an unexpected heavyweight in the energy-boosting stakes—a true dark horse.

Does Coffee Really Stain Your Teeth?

Everyone assumes coffee ruins your smile—but the experiment told a different story. Researchers at New York University College of Dentistry, led by Dr. Mark Wolff, soaked human teeth in various drinks for a week: black tea, coffee, red wine, cola, sports drinks, and tomato juice.

The biggest surprise? Coffee ranked low on the staining scale. After a week, teeth exposed to coffee showed almost no visible discoloration. Tea took second place in staining intensity. Sports drinks slightly eroded enamel due to acidity. But cola—thanks to its artificial colorants—ranked third for visible tooth staining.

Wine and Tea: The Real Tooth Stainers

The top spot for teeth staining went to red wine. Teeth soaked in wine turned nearly purple due to its deep-set chromogens—intensely pigmented compounds that cling to enamel. Black tea came in second, with a strong yellow-brown tint. Tomato juice also contributed to staining, though less severely.

Surprisingly, tomato juice was gentler on teeth than expected. And while white wine didn’t stain on its own, drinking it before other pigmented beverages actually made stains worse by opening up pores in the enamel. The visual proof? Teeth that had contact with both white wine and other drinks ended up darker than those exposed to just the colored liquids.

What This Means for Your Drink Choices

If you’re chasing a caffeine kick, don’t underestimate cola. Its 300mg per can is not only higher than most coffees, but also more than an entire shot-heavy espresso lineup. And if you’re avoiding stained teeth, coffee isn’t your biggest worry—red wine and black tea take that crown. Even seemingly harmless drinks like sports beverages and cola can affect your teeth more than you think.

So the next time you reach for a quick boost or worry about discoloration, remember: the most obvious culprits aren’t always the worst offenders. Science, not assumption, paints the clearest picture.

Frequently Asked Questions

How much caffeine is in a can of cola compared to coffee?

A 12oz can of cola contains around 300mg of caffeine, which is roughly equivalent to two 8oz cups of brewed coffee (150mg each) or six 1oz espressos (about 30–50mg each).

Which drink has more caffeine—tea or coffee?

Brewed coffee has significantly more caffeine than tea. An 8oz cup of coffee contains about 150mg of caffeine, while black tea has 50mg and green tea has 30mg for the same serving size.

Does coffee really stain your teeth the most?

No. In a week-long experiment, coffee caused almost no visible staining on teeth. Red wine and black tea were the top two drinks that stained teeth, with wine causing the most discoloration.

What drink stained teeth the worst in the experiment?

Red wine was the biggest teeth stainer. After seven days, teeth soaked in red wine turned nearly purple due to its deep color pigments, followed by black tea and then cola.

Does cola have more caffeine than espresso?

Yes. A single 12oz can of cola (300mg caffeine) equals the caffeine of about six 1oz espressos (around 30–50mg each), making cola a more potent caffeine source in a single serving.

Is tea better than coffee for your teeth?

Not necessarily. While coffee stained teeth minimally, black tea still caused noticeable discoloration. Tea ranked higher than coffee in the tooth-staining experiment, though both were milder than red wine.

Recommended FrontStreet Beans for Energy & Clarity

For coffee drinkers seeking a cleaner caffeine lift without the hidden sugar or colorants of cola, try FrontStreet Coffee’s Ethiopia Yirgacheffe for bright citrus and floral notes, or their Guatemala Antigua with chocolatey richness and balanced acidity. Both single origins highlight coffee’s natural stimulation without the mystery ingredients. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.