Table sugar is officially called sucrose. That’s the scientific name you’ll find in chemistry textbooks, nutrition labels, and medical literature. It’s a single molecule made of two simpler sugars, glucose and fructose, bonded together, with the chemical formula C₁₂H₂₂O₁₁. But sucrose is far from the only alternate name. Depending on the context, table sugar goes by a surprising number of aliases.
The Scientific Name: Sucrose
Sucrose is classified as a disaccharide, meaning it’s built from two sugar units. One unit is glucose (the sugar your body uses most readily for energy) and the other is fructose (the sugar that makes fruit taste sweet). These two molecules are locked together by a chemical bond that your body has to break before it can absorb either one.
The sucrose in a bag of white sugar is chemically identical whether it comes from sugarcane or sugar beets. Sugarcane contains 7 to 18 percent sucrose by weight, while sugar beets range from 8 to 22 percent. After refining, both sources yield the same pure compound.
Names You’ll See in the Kitchen
Cooks and bakers use several names for what is essentially sucrose processed to different crystal sizes:
- Granulated sugar is the standard white table sugar with medium, uniform crystals. It dissolves easily into batters and is the default “sugar” in most recipes.
- Superfine sugar (also called caster sugar, baker’s special sugar, or extra-fine sugar) is the same granulated sugar ground to smaller crystals so it dissolves faster, especially in cold drinks and delicate meringues.
- Confectioners’ sugar (also called powdered sugar or icing sugar) is granulated sugar blitzed into a fine powder with a small amount of cornstarch added to prevent clumping.
All three start as sucrose. The only differences are crystal size and, in the case of confectioners’ sugar, that anti-caking cornstarch.
Names You’ll See on Ingredient Labels
Food manufacturers don’t always write “sucrose” or “sugar” on a package. Researchers at the University of California, San Francisco have identified at least 61 different names for sugar on food labels. Some are chemically distinct from sucrose (like dextrose, which is pure glucose, or maltose, which is two glucose molecules). Others are simply alternate names or close relatives. Common ones include barley malt, rice syrup, and high-fructose corn syrup. If you’re scanning an ingredient list for added sugar, knowing that sucrose is just one entry in a long lineup helps you spot the rest.
How Your Body Handles Sucrose
When you eat table sugar, it travels intact to your small intestine. There, cells lining the intestinal wall produce an enzyme that snips the bond between the glucose and fructose halves. Once separated, both simple sugars pass through the intestinal lining and enter your bloodstream. Glucose heads straight into circulation, where your cells can burn it for fuel. Fructose takes a detour through the liver first, where it gets converted into usable energy or stored.
This split personality gives sucrose a moderate glycemic index of 65, roughly midway between pure glucose (100) and pure fructose (25). That means table sugar raises blood sugar faster than fruit sugar alone but not as sharply as glucose tablets or white bread.
Calories and Recommended Limits
One level teaspoon of granulated sugar contains about 16 calories and 4 grams of carbohydrate, with no fat, protein, fiber, or meaningful vitamins. It’s pure energy with nothing else attached.
The American Heart Association recommends that men cap added sugar at 9 teaspoons (36 grams) per day and women at 6 teaspoons (25 grams) per day. A single 12-ounce can of regular soda typically contains about 10 teaspoons, which already exceeds both limits. These guidelines apply to all added sugars, not just the granulated kind from a sugar bowl. Honey, agave, maple syrup, and the many label synonyms all count toward the same daily total.
How Raw Sugar Becomes White Sugar
Sucrose starts as juice pressed from sugarcane or extracted from sugar beets. Turning that cloudy, brown liquid into the white crystals in your pantry takes several rounds of purification. First, raw sugar crystals are washed in a warm syrup that softens and strips away the outer layer of molasses without dissolving the crystal itself. The crystals are then spun in a centrifuge to separate them from the syrup.
Next, the dissolved sugar liquor goes through a cleaning step where tiny clumps of chalk (or phosphate) form inside the liquid. As these clumps grow, they trap impurities, color compounds, and fine particles. Filtering them out leaves a much clearer liquid. A final pass through activated carbon or ion-exchange columns removes remaining color, producing the nearly colorless solution that gets evaporated and crystallized into white granulated sugar.
Brown sugar, by contrast, is simply white sugar with some molasses mixed back in, which is why it has a slightly different flavor and moisture level but is still sucrose at its core.