Sweet tea is slightly better for you than Coke, but neither qualifies as a healthy drink. A 12-ounce Coke contains 146 calories and 41 grams of sugar, while the same serving of sweetened iced tea has about 125 calories and 35 grams of sugar. That’s a modest difference, and both drinks deliver far more added sugar than your body needs in a single sitting. The real gap between them comes down to what else is in the glass beyond the sugar.
Sugar and Calories Side by Side
A 12-ounce Coke packs roughly 10 teaspoons of sugar. Sweet tea lands around 8 teaspoons per serving, according to data compiled by Harvard’s School of Public Health. That 6-gram difference saves you about 20 calories, which is meaningful if you’re drinking multiple glasses a day but negligible as a one-time choice. Both drinks blow past the American Heart Association’s recommended daily limit of about 6 teaspoons for women and 9 for men, meaning a single glass of either one can max out your sugar budget.
Homemade sweet tea is a wildcard here. Recipes vary enormously. A lightly sweetened glass might contain half the sugar of a bottled version, while a traditional Southern sweet tea can rival or even exceed Coke’s sugar content. If you’re making it yourself, you have direct control over the sugar, which is an advantage no canned soda offers.
The Sweetener Itself Matters
Coke is sweetened with high-fructose corn syrup, which is roughly 60% fructose and 40% glucose. Sweet tea, whether homemade or from most bottled brands, typically uses regular table sugar (sucrose), a 50/50 split of fructose and glucose. That might sound like a trivial distinction, but the way your body handles fructose is worth understanding.
Glucose enters general circulation and gets used by your brain, muscles, and other tissues throughout the body. Fructose takes a different route: it goes straight to the liver, where it’s processed by a dedicated enzyme. At high doses, the liver converts excess fructose into fat through a process that lacks many of the built-in brakes that glucose metabolism has. Over time, heavy fructose intake promotes fat buildup in the liver, raises triglycerides, and contributes to metabolic problems. Since Coke’s sweetener contains a higher proportion of fructose than table sugar, it pushes slightly more of that burden onto the liver per serving. That said, research from the American Society for Nutrition makes clear that added sugar in high concentrations is harmful regardless of which type you’re consuming.
What’s in the Glass Besides Sugar
This is where sweet tea pulls further ahead. Black tea contains polyphenols, plant compounds with strong anti-inflammatory and antioxidant properties. These compounds survive the brewing and sweetening process. While green tea gets the most attention for its antioxidant content, black tea still delivers a meaningful dose of polyphenols that may support cardiovascular health and reduce inflammation over time.
Coke, on the other hand, contains phosphoric acid, which gives it that sharp, tangy bite. Phosphoric acid can interfere with your body’s ability to absorb calcium, a concern that compounds over years of regular consumption. It also contains caramel coloring, which produces a byproduct called 4-MEI during manufacturing. The FDA has reviewed animal studies showing potential health effects from 4-MEI at very high doses but states that current levels in food are far below those thresholds and don’t warrant dietary changes. Still, it’s an additive with no nutritional upside.
In short, sweet tea gives you something beneficial (antioxidants) alongside the sugar. Coke gives you additives that range from neutral to mildly concerning alongside the sugar.
Caffeine Differences
Both drinks contain caffeine, but in different amounts. An 8-ounce serving of brewed black tea has about 48 milligrams of caffeine, while 8 ounces of cola has about 33 milligrams, according to the Mayo Clinic. Scaled to a 12-ounce glass, sweet tea would deliver roughly 72 milligrams compared to Coke’s 50 milligrams. Neither amount is high enough to cause problems for most adults (the general safe limit is around 400 milligrams per day), but it’s worth noting if you’re sensitive to caffeine or drinking sweet tea late in the day.
Effects on Your Teeth
Both drinks are acidic enough to erode tooth enamel over time. Sodas have an average pH of about 3.1, while teas average around 3.5. For reference, water sits at a neutral 7.0, and enamel starts dissolving below about 5.5. So both beverages are well into the danger zone for dental erosion, though Coke is slightly more acidic. The sugar in both drinks also feeds the bacteria responsible for cavities, compounding the problem. Drinking either one through a straw and rinsing your mouth with water afterward can reduce contact with your teeth.
The Practical Takeaway
If you’re choosing between the two, sweet tea is the better option. It has less sugar per serving, contains beneficial antioxidants, uses a slightly less problematic sweetener, and doesn’t include phosphoric acid. But the margin isn’t enormous. Drinking three glasses of sweet tea a day will still deliver a heavy load of added sugar with all the metabolic consequences that come with it. The biggest advantage sweet tea offers is the ability to control the recipe: brew it at home with a fraction of the sugar, and you end up with a genuinely different drink than what comes out of a soda can.