Free sugar is any sugar that has been added to food or drinks, plus sugar naturally present in honey, syrups, and fruit juice. The World Health Organization created this term to distinguish between sugars that raise health risks and sugars that are still locked inside whole foods like intact fruit and vegetables. If sugar has been extracted, squeezed out, or stirred in during cooking or manufacturing, it counts as free sugar.
How Free Sugar Differs From Other Types
The language around sugar can be confusing because nutrition labels, dietary guidelines, and health organizations don’t always use the same terms. Here’s how the categories break down.
Total sugars refers to every sugar molecule in a food, whether it occurs naturally or was added. This includes glucose, fructose, sucrose, lactose, maltose, and galactose.
Added sugars covers sugars and syrups put into foods during processing or preparation. This is the term you’ll see on U.S. nutrition labels.
Free sugars is a broader category. It includes everything classified as added sugar, but it also includes sugars naturally present in honey, syrups, fruit juice, and fruit juice concentrate. A glass of fresh-squeezed orange juice contains free sugar even though nobody added anything to it, because squeezing the fruit releases the sugar from its original structure.
Intrinsic sugars are sugars still physically trapped inside the cells of intact fruits and vegetables. Because the fiber and cell walls slow digestion and limit how fast sugar enters your bloodstream, these sugars are not considered a health concern in the same way. Lactose, the sugar naturally present in milk, is also excluded from the free sugar category.
Why the Distinction Matters
Your body processes all sugar molecules the same way regardless of their source. The difference is context. When you eat a whole apple, the fiber slows absorption, you feel full sooner, and the total sugar load is relatively small. When you drink apple juice, the fiber is gone, the sugar hits your system quickly, and it’s easy to consume the equivalent of several apples in one sitting. That speed and volume is what drives health problems.
High free sugar intake overloads the liver, which metabolizes sugar in a way similar to alcohol and converts the excess into fat. Over time, this can lead to fatty liver disease, a condition that contributes to insulin resistance and diabetes. The downstream effects of too much free sugar, including higher blood pressure, chronic inflammation, weight gain, and fatty liver, are all linked to increased risk of heart attack and stroke.
Dental health is the other major concern. Free sugars feed the bacteria in your mouth that produce acid and erode tooth enamel. The WHO notes that keeping free sugar below 5% of daily calories minimizes the risk of cavities across a person’s entire lifetime.
How Much Is Too Much
The WHO recommends keeping free sugars below 10% of total daily calories, with a conditional recommendation to aim for under 5% for additional benefits. The U.S. Dietary Guidelines for Americans (2020–2025) set the same 10% ceiling for added sugars. On a standard 2,000-calorie diet, that works out to no more than about 200 calories from sugar, or roughly 12 teaspoons per day. Children under 2 should not consume any added sugars at all.
To put that in perspective: a standard 12-ounce can of soda contains around 9 to 10 teaspoons of sugar, which would eat up most of your daily budget in a single drink. Soft drinks typically contain about 8.6 grams of free sugar per 100 milliliters, meaning that can alone delivers roughly 26 grams. Flavored yogurts average around 10 grams of free sugar per 100 grams, and a typical cereal bar packs about 24 grams per 100 grams.
Where Free Sugar Hides in Your Food
Sugar shows up on ingredient lists under dozens of names. Some are obvious (brown sugar, cane sugar, high fructose corn syrup), but many are not. Barley malt syrup, dextrose, evaporated cane juice, maltodextrin, rice syrup, turbinado sugar, treacle, and fruit juice concentrate are all free sugars. Agave nectar and coconut sugar are often marketed as healthier alternatives, but they count as free sugar too.
A useful rule: if an ingredient is a syrup, a concentrate, or a word ending in “-ose” (glucose, fructose, maltose, sucrose, dextrose), it’s free sugar. Honey is one that surprises people because it feels natural and unprocessed, but it is one of the most sugar-dense foods you can eat, with a median free sugar content of about 78 grams per 100 grams.
Foods That Don’t Count as Free Sugar
Eating a whole orange, a handful of blueberries, or a raw carrot does not contribute to your free sugar intake. The sugars in these foods are intrinsic, locked within the plant’s cellular structure, and they come packaged with fiber, water, and micronutrients that change how your body handles them. Plain milk and plain yogurt with no added sweeteners also fall outside the free sugar category because lactose is classified separately.
The line can feel arbitrary in some cases. A whole mango is not free sugar, but mango puree used as a sweetener in a smoothie bowl is. Whole grapes are fine, but grape juice concentrate used to sweeten a granola bar is free sugar. The key question is whether the sugar is still inside an intact piece of fruit or vegetable, or whether it has been extracted and used as a sweetening ingredient.
Reading Labels Effectively
In the United States, nutrition labels list “Added Sugars” as a line item under total carbohydrates. This captures most free sugars but technically misses one category: 100% fruit juice. If you drink a glass of pure orange juice with nothing added, the label will show zero added sugars, but the WHO would still classify that sugar as free. For practical purposes, treating both “added sugars” on labels and fruit juice sugars as free sugars gives you an accurate picture.
When scanning ingredient lists, look at the order. Ingredients are listed by weight, so if any form of sugar appears in the first three or four positions, the product is likely sugar-heavy. Many processed foods use multiple types of sugar (corn syrup plus dextrose plus fruit juice concentrate, for example), which pushes each one further down the list and makes the total sugar content less obvious at a glance.