Mountain Dew isn’t the single worst soda you can drink, but it does rank worse than most mainstream options on nearly every measure that matters: sugar, caffeine, acidity, and ingredients. A 20-oz bottle contains 77 grams of sugar, compared to 65 grams in the same size Coca-Cola. It’s more acidic, higher in caffeine, and has historically contained ingredients that other sodas never used. So while energy drinks and some specialty sodas are technically worse, Mountain Dew sits near the top of the “worst” list among sodas you’d grab at a gas station.
Sugar Content Compared to Other Sodas
A 20-oz Mountain Dew packs 77 grams of sugar. That same size Coca-Cola has 65 grams. Per 8-oz serving, Mountain Dew contains 29 grams of sugar, which means a standard 12-oz can has roughly 46 grams. That’s noticeably more than Coke or Pepsi can for can.
To put those numbers in perspective, the American Heart Association recommends no more than about 6 teaspoons of added sugar per day for women (25 grams) and 9 teaspoons for men (36 grams). A single 12-oz Mountain Dew exceeds both limits. A 20-oz bottle blows past them by two to three times. Other sodas exceed these limits too, but Mountain Dew gets you there faster.
The sweetener itself is high fructose corn syrup, which is standard across most non-diet sodas. Mountain Dew doesn’t use a uniquely harmful type of sugar. It just uses more of it per ounce than its closest competitors.
More Caffeine Than Most Colas
A 12-oz Mountain Dew contains 54 mg of caffeine. That’s roughly 60% more than Coca-Cola (34 mg) and about 50% more than Pepsi (35 to 38 mg). It’s not in energy drink territory, but among mainstream sodas, Mountain Dew is one of the most caffeinated options on the shelf.
Interestingly, the Zero Sugar version is even higher at 68 mg per 12 oz. That puts it closer to a cup of weak coffee than a typical soft drink. For people who are sensitive to caffeine or who drink multiple cans throughout the day, this adds up quickly and can contribute to sleep disruption, anxiety, or heart palpitations.
Acidity and Tooth Damage
This is where Mountain Dew separates itself from other sodas in a meaningful way. Regular Mountain Dew has a pH of about 3.22, and some varieties like Mountain Dew Voltage drop even lower to 3.05. Tooth enamel begins dissolving below a pH of 4.0, and for every one-unit drop in pH below that threshold, enamel dissolves roughly ten times faster. So the difference between a pH of 3.5 and 3.0 isn’t minor; it’s an order of magnitude more erosive.
A study cataloging 380 beverages found that 39% fell into the “extremely erosive” category (pH below 3.0) and 54% were classified as “erosive” (pH 3.0 to 3.99). Mountain Dew lands right at the border, with some of its flavors crossing into the extremely erosive range. Most colas are acidic too, but Mountain Dew’s combination of citric acid and high sugar creates a particularly damaging environment for teeth.
The term “Mountain Dew mouth” exists for a reason. Cleveland Clinic describes it as extensive cavities that visibly darken and break teeth, seen in people who drink the soda frequently. The name stuck because of how commonly dentists in certain regions, particularly rural Appalachia, observed the pattern among heavy Mountain Dew drinkers. The condition isn’t unique to Mountain Dew (any soda can cause severe decay), but the drink’s acidity, sugar load, and sipping habits make it a frequent culprit.
Ingredients Other Sodas Don’t Have
Mountain Dew contains Yellow 5 (tartrazine), a synthetic food dye that gives it its signature neon color. Most colas don’t use this dye. Less than 0.1% of people have a true sensitivity to Yellow 5, but for those who do, it can trigger hives, itching, coughing, or vomiting. People with aspirin sensitivity are more likely to react to it. One study in young children found it worsened eczema symptoms in about 1 in 12 participants. For most people, Yellow 5 is a non-issue, but it’s an ingredient you’re consuming with Mountain Dew that you’d avoid entirely by choosing a cola.
Mountain Dew also had a more troubling ingredient history. It previously contained brominated vegetable oil (BVO), a chemical used to keep the citrus flavoring evenly distributed. In 2024, the FDA officially revoked authorization for BVO in food after studies conducted with the National Institutes of Health found potential for adverse health effects in humans. PepsiCo had already begun removing BVO from Mountain Dew before the ban, but the fact that it was ever in the formula is part of why Mountain Dew developed a worse reputation than other sodas. The compliance deadline for full removal from all products is August 2025.
What’s Actually Worse Than Mountain Dew
Energy drinks consistently outrank Mountain Dew in sugar, caffeine, and overall health risk. A 500 mL (about 17 oz) Rockstar Super Sours contains 83.5 grams of sugar, and it packs far more caffeine than Mountain Dew. Other energy drinks like Monster and V follow a similar pattern. If you’re looking for the true “worst” category of carbonated, sugary beverages, energy drinks win that contest easily.
Among standard sodas, though, Mountain Dew is genuinely one of the least healthy choices. It has more sugar per ounce than Coke or Pepsi, more caffeine, comparable or greater acidity, and a dye that most competitors skip. It’s not in a class by itself, but it’s near the front of a bad pack.
The Zero Sugar Version
Mountain Dew Zero Sugar eliminates the sugar and calories entirely, using a blend of three artificial sweeteners: aspartame, acesulfame potassium, and sucralose. It still contains Yellow 5, citric acid, and 68 mg of caffeine per can. So while you avoid the sugar problem, you don’t avoid the acidity (which still erodes enamel), the caffeine load, or the dye. It’s a better option than regular Mountain Dew by a significant margin, but it’s not a clean bill of health in a can.