Among standard 12-ounce cans, Mountain Dew tops the list at 46 grams of sugar, followed closely by Fanta at 44 grams. A single can of either one nearly doubles the daily added sugar limit recommended for women (25 grams) and exceeds the limit for men (36 grams). If you grab a 20-ounce bottle instead, the numbers get significantly worse.
The Highest-Sugar Sodas Per 12-Ounce Can
Data from the UConn Rudd Center for Food Policy and Health ranks major soda brands by sugar content. When comparing standard 12-ounce servings, here’s how they stack up:
- Mountain Dew: 46g sugar
- Fanta: 44g sugar
- Dr Pepper Cherry: 42g sugar
- Cheerwine: 42g sugar
- Pepsi: 41g sugar
- Coca-Cola Classic: 40.5g sugar
The gap between the top and bottom of this list is only about 5.5 grams, roughly a teaspoon and a half. So while Mountain Dew leads, the honest answer is that most regular sodas land in the same neighborhood of 40 to 46 grams per can.
Fruit-Flavored Sodas Pack More Than Colas
A pattern worth noticing: fruit-flavored sodas consistently beat traditional colas in sugar content. Fanta carries about 3.5 more grams of sugar per can than Coca-Cola Classic. Mello Yello, another Coca-Cola citrus brand, hits 77 grams in a 20-ounce bottle. Fruit-flavored sodas from the Dr Pepper Snapple Group reach 72 grams in the same size. That fruity taste comes at a cost, because these drinks need more sweetener to hit the flavor profile consumers expect.
If you assume a cola is the sugariest option in a vending machine, you’re probably wrong. The orange, grape, or citrus option next to it likely has a few extra grams per serving.
Bottle Size Changes Everything
Most people don’t drink 12-ounce cans anymore. The standard bottle sold at gas stations and convenience stores is 20 ounces, and that size inflates the sugar totals dramatically. A 20-ounce Mello Yello contains 77 grams of sugar. A 20-ounce Coca-Cola hits about 65 grams. A 600-milliliter Coke (roughly 20 ounces) sold in Australia contains 63.6 grams.
The catch is that nutrition labels on these bottles often list values “per serving,” with the bottle containing more than one serving. A 20-ounce bottle might define a serving as 12 ounces and list the remaining 8 ounces as a second partial serving. Very few people pour out two-thirds of a bottle and save the rest. If you drink the whole thing, you’re getting the full sugar load, which can easily reach 65 to 77 grams in a single sitting.
How Your Body Handles Liquid Sugar
Sugar in soda hits your system differently than sugar in solid food. Most major soda brands in the U.S. use high-fructose corn syrup, which contains roughly 60% fructose and 40% glucose. That ratio matters because your liver processes fructose differently than glucose.
A randomized controlled trial published in the Journal of Hepatology found that people who drank fructose- or sucrose-sweetened beverages daily saw their liver’s fat production double compared to a control group. The liver’s rate of producing new fat jumped from about 9% per day in the control group to nearly 21% in the sucrose group and 20% in the fructose group. People who drank glucose-sweetened beverages didn’t see this effect at all. The fructose component of soda is what drives the metabolic impact, and soda delivers it in concentrated liquid form that floods the liver quickly.
How One Can Compares to Daily Limits
The American Heart Association recommends no more than 36 grams of added sugar per day for men and 25 grams for women. A single 12-ounce Mountain Dew at 46 grams blows past both limits before you eat anything else that day. Even a Coca-Cola Classic at 40.5 grams exceeds both thresholds.
To put it in practical terms, every regular soda on the top-ten list delivers a full day’s worth of added sugar (or more) in one drink. If you’re having a soda with a meal that includes ketchup, bread, or a dessert, your total added sugar intake for that meal alone could reach two to three times the recommended daily maximum.
Are Brands Reducing Sugar?
Some companies are making changes, though the progress is uneven. PepsiCo reported in early 2025 that 67% of its beverage volume now contains fewer than 100 calories from added sugars per 12-ounce serving, hitting its 2025 target a year early. That sounds encouraging, but it largely reflects the growing popularity of diet and zero-sugar versions rather than reformulated recipes for flagship products. A regular Pepsi still contains 41 grams of sugar per can, the same as it has for years.
The most effective sugar reduction for any individual soda drinker remains switching to a zero-sugar version or cutting portion size. Dropping from a 20-ounce bottle to a 12-ounce can of the same brand cuts your sugar intake by roughly 40%, no reformulation needed.