A single 12-ounce can of cola contains about 39 to 41 grams of sugar, which is more than an entire day’s worth of added sugar for most adults. The American Heart Association recommends no more than 36 grams per day for men and 25 grams per day for women. By that math, one standard soda puts you at or over the limit before you eat anything else.
What Counts as a High-Sugar Drink
Several countries have drawn official lines in the sand. The United Kingdom’s sugar tax kicks in at 5 grams of sugar per 100 milliliters, which works out to about 18 grams in a standard 12-ounce serving. Chile’s threshold is slightly higher at 6.25 grams per 100 milliliters. These aren’t arbitrary numbers. They reflect the point at which a drink starts contributing meaningful amounts of sugar to your diet with each serving.
A practical rule: check the nutrition label and look at the “added sugars” line. If a single serving delivers more than half your daily limit (so roughly 12 to 18 grams depending on your sex), that drink is doing a lot of damage to your sugar budget. For context, here’s what common drinks contain in a 12-ounce pour:
- Coca-Cola or Pepsi: 41 grams of sugar (about 10 teaspoons)
- Orange juice (Minute Maid): 41 grams of sugar (about 10 teaspoons)
- Gatorade: 22 grams of sugar (about 5 teaspoons)
Orange juice often surprises people. It contains the same amount of sugar as a cola, and while it does deliver some vitamins, your body processes that liquid sugar in much the same way.
Why Liquid Sugar Hits Harder Than Solid Sugar
Your body doesn’t treat sugar in a drink the same way it treats sugar in a cookie or a piece of fruit. Liquid sugar moves through your stomach quickly and floods your bloodstream faster. It also doesn’t satisfy your appetite the way solid food does. You can drink 300 calories of soda and still feel just as hungry as before, so you end up eating on top of it.
A two-year study tracking children found that liquid sugar intake predicted insulin resistance (a precursor to type 2 diabetes) even after controlling for total calorie intake and physical activity. Solid sugar intake from foods like candy and baked goods did not show the same effect. The delivery method matters. When sugar arrives as a liquid, it bypasses many of the body’s normal checks on appetite and blood sugar regulation.
What Happens in Your Liver
Much of the sugar in sweetened drinks is fructose, either from high-fructose corn syrup or from table sugar (which is half fructose). Unlike glucose, which your muscles and brain readily use for energy, fructose goes almost entirely to the liver for processing. When fructose arrives in large amounts, especially as a liquid that gets absorbed quickly, the liver converts it into fat through a process called de novo lipogenesis.
This isn’t a slow, subtle process. Fructose directly activates the genetic machinery that ramps up fat production in liver cells, and it bypasses the normal rate-limiting steps that would slow things down with other sugars. Over time, this leads to fat accumulating in the liver itself. Fatty liver disease, once associated almost exclusively with heavy alcohol use, is now common in people who have never had a drink of alcohol, and excessive fructose consumption from sweetened beverages is considered a primary driver.
The Cardiovascular Risk
The long-term consequences go beyond liver health. Research from Harvard found that adding just one sugary drink per day was associated with roughly an 18% increase in cardiovascular disease risk. And you can’t exercise your way out of it. People who drank two or more sugary beverages daily but still met the recommended 150 minutes of weekly exercise had a 21% higher risk of heart disease compared to people who rarely drank sweetened beverages. The sugar itself causes metabolic changes that physical activity alone doesn’t fully counteract.
How the Guidelines Break Down
The World Health Organization recommends keeping all free sugars (added sugars plus sugars naturally present in juice, honey, and syrups) below 10% of your total daily calories. For someone eating 2,000 calories a day, that’s 50 grams. The WHO goes further and suggests that dropping below 5%, or 25 grams, provides additional health benefits. The American Heart Association’s limits are even stricter: 36 grams for men, 25 grams for women.
No matter which guideline you follow, the takeaway is the same. A single can of soda, a bottle of sweetened iced tea, or a large glass of juice can consume your entire daily sugar allowance in minutes. The “too much” threshold isn’t some extreme quantity. For most sweetened drinks on the market, one full serving is already too much if it’s a regular habit.
Sugar Limits for Children
The stakes are higher for kids because the recommended limits are lower and their bodies are still developing metabolic patterns. The American Academy of Pediatrics recommends no added sugars at all for children under 2 years old. Children under 1 shouldn’t drink juice either, even 100% fruit juice. For kids ages 2 through 5, the AAP advises avoiding flavored milks and sugary drinks to prevent them from developing a lasting preference for sweet tastes early in life.
Children’s drinks are often marketed with images of fruit and claims like “made with real juice,” but many of these products contain sugar loads comparable to soda. Reading the nutrition label is the only reliable way to know what’s actually in the bottle. If a drink marketed to children contains more than a few grams of added sugar per serving, it’s working against your child’s health rather than supporting it.
Practical Ways to Cut Back
You don’t need to eliminate sweetened drinks overnight, but knowing the numbers helps you make better choices. If you’re choosing between a 20-ounce bottle of soda (which can contain 65 grams of sugar) and a 12-ounce can, the smaller size alone cuts your sugar intake by a third. Diluting juice with water, choosing sparkling water with a splash of citrus, or switching to unsweetened tea are all strategies that bring you well under the threshold without requiring willpower at every meal.
Pay attention to serving sizes on labels. Many bottles and cans contain two or more servings, so the sugar content you see on the label may represent only half of what you’ll actually consume if you drink the whole thing. A 20-ounce bottle might list 32 grams of sugar per serving but contain 2.5 servings, totaling 80 grams in one bottle. That’s more than double the daily limit for men and more than triple the limit for women.