Free sugars are any sugars that have been removed from their original food structure. The term covers all sugars added to food and drinks by manufacturers, cooks, or consumers, plus the sugars naturally present in honey, syrups, fruit juices, and fruit juice concentrates. What makes them “free” is that they’re no longer bound inside the cells of a whole food, which changes how your body handles them.
The distinction matters because free sugars are the specific type health organizations target when they set limits. The World Health Organization recommends keeping free sugars below 10% of your total daily calories, with an ideal target of less than 5%. For someone eating 2,000 calories a day, that 5% target works out to about 25 grams, or roughly 6 teaspoons.
What Counts as a Free Sugar
The category is broader than most people expect. It includes the obvious sources: table sugar, high-fructose corn syrup, and any sweetener a manufacturer stirs into a product. But it also includes sweeteners many people consider natural or healthy. Honey, maple syrup, agave nectar, coconut sugar, molasses, rice syrup, and date syrup all count as free sugars regardless of how minimally processed they are. A spoonful of honey in your tea is a free sugar in the same way a spoonful of white sugar is.
Fruit juice is the category that surprises most people. When you squeeze an orange, the sugars that were locked inside the fruit’s cell walls are released into liquid form. Those sugars are now free sugars, even though nothing was “added.” The same applies to fruit juice concentrates, which food manufacturers frequently use to sweeten products while keeping the ingredient list looking wholesome. A granola bar sweetened with apple juice concentrate contains free sugars just like one sweetened with corn syrup.
Sugars that remain inside the intact cell structure of whole fruits, vegetables, and grains are classified as intrinsic sugars and are not free sugars. Lactose, the sugar naturally present in milk, is also excluded from the free sugar category.
Why Free Sugars Are Treated Differently
The reason whole fruit gets a pass while fruit juice doesn’t comes down to how your body processes each one. When sugar is locked inside plant cells surrounded by fiber, your digestive system has to break down that structure before absorbing the sugar. This slows the process, giving your liver a steady, manageable supply of sugar over time.
Free sugars skip that step entirely. They’re already in a form your body can absorb rapidly, which means they hit your bloodstream faster and in higher concentrations. This triggers a larger insulin response and makes it easy to consume far more sugar than you would from whole foods. You can drink a glass of orange juice containing the sugar of three or four oranges in under a minute, but eating three or four whole oranges takes much longer, and the fiber fills you up before you get that far.
Free sugars also add calories without bringing along the vitamins, minerals, and fiber that come with whole foods. The WHO describes this as providing “significant energy without specific nutrients,” which can crowd out more nutritious foods in your diet and contribute to unhealthy weight gain over time.
Health Risks of High Intake
Dental cavities are the most direct and well-established consequence of high free sugar consumption. Cavities remain the most prevalent noncommunicable disease globally, and free sugars are their primary dietary driver. In children, severe dental decay causes pain, missed school days, and anxiety around eating.
Beyond your teeth, consistently high free sugar intake increases the risk of obesity, which itself is a major risk factor for type 2 diabetes, cardiovascular disease, and certain cancers. The mechanism is straightforward: free sugars make it easy to consume excess calories because they don’t trigger the same fullness signals as whole foods containing the same amount of energy.
How to Spot Free Sugars on Labels
Nutrition labels in the U.S. list “added sugars” as a separate line under total sugars, which captures most free sugars. The FDA’s definition of added sugars specifically includes honey, syrups, and sugars from concentrated fruit or vegetable juices beyond what you’d find in the equivalent amount of whole juice. So if a product uses apple juice concentrate as a sweetener, that excess sugar shows up in the added sugars count.
The ingredient list is where things get tricky. Researchers at UCSF have identified at least 61 different names for sugar on food labels. Some are obvious (brown sugar, corn syrup, honey), but many are not. Names like barley malt, evaporated cane juice, dextrose, maltose, muscovado, panocha, refiner’s syrup, and treacle all refer to free sugars. Fruit juice concentrate, golden syrup, and rice syrup are easy to overlook as sweeteners.
A useful rule of thumb: any ingredient that is a syrup, any word ending in “-ose” (fructose, glucose, maltose, sucrose, dextrose), and any form of juice concentrate is a free sugar. Manufacturers sometimes split sweeteners across multiple types so that no single one appears high on the ingredient list, which is sorted by weight. If you see three or four different sugar names scattered through the list, the product likely contains more free sugar than any one ingredient would suggest.
What Doesn’t Count
Whole fruits, dried fruits (with no added sugar), vegetables, plain milk, and plain yogurt do not contain free sugars. The sugar in a banana or a handful of raisins is intrinsic sugar, still bound within the food’s cellular structure or, in the case of dairy, naturally present as lactose. These foods come packaged with fiber, water, protein, or fat that slows digestion and limits how much you’re likely to eat in one sitting.
This doesn’t mean intrinsic sugars are calorie-free or that you can eat unlimited dried fruit. It means the body handles them differently enough that health organizations don’t set intake limits for them the way they do for free sugars. The practical takeaway: swapping a glass of apple juice for a whole apple, or replacing honey-sweetened yogurt with plain yogurt and fresh berries, reduces your free sugar intake while keeping the sweetness and nutrients intact.