Table sugar is sucrose, a molecule built from two simpler sugars, glucose and fructose, bonded together in a 1:1 ratio. It comes from one of two crops: sugarcane or sugar beets. Despite their very different appearances, both plants produce the same molecule, and the white crystals in your sugar bowl are chemically identical regardless of the source. Globally, sugarcane accounts for more than 85% of sugar production, with sugar beets making up the rest.
What Sucrose Actually Is
Sucrose is a disaccharide, meaning it’s two simple sugars linked together. One glucose molecule and one fructose molecule are joined by an oxygen bridge between their cores. When you eat table sugar, enzymes in your small intestine quickly split that bond, releasing the glucose and fructose into your bloodstream separately. Glucose is your body’s primary fuel source, while fructose is processed mainly by the liver.
Refined white sugar must be at least 99.5% pure sucrose to meet USDA standards. That extreme purity is why table sugar has no vitamins, minerals, fiber, or fat. It provides about 4 calories per gram and has a glycemic index of 65, placing it in the medium range (pure glucose, by comparison, sits at 100).
How Sugar Is Extracted From Sugarcane
Sugarcane is a tall tropical grass, and turning it into white crystals requires several rounds of crushing, boiling, and spinning. The process starts at the mill, where machines break the hard cane stalks and grind them to squeeze out juice. Hot water is sprayed onto the crushed cane between passes through the mill to pull out as much sugar as possible. The leftover fibrous material, called bagasse, is often burned as fuel to power the mill itself.
The raw juice is strained, then clarified by adding lime and heating it to about 200°F. Lime neutralizes acids in the juice, and the heat causes impurities to clump into a heavy sediment that settles out. The clean juice moves to a series of evaporators, typically five in a row, which boil off water until the liquid becomes a thick syrup of roughly 65% solids. That syrup gets another round of clarification before the real magic happens: crystallization.
Inside large vacuum pans, the syrup is boiled under reduced pressure until it becomes supersaturated. Tiny seed crystals are introduced, and sugar crystals begin to grow around them. The resulting thick mixture of crystals and liquid is spun in high-speed centrifuges. Crystals stay in the basket; the liquid spun off is molasses. This boiling and spinning cycle repeats two or three times, each round extracting more sugar from increasingly dark molasses. The final batch of molasses, sometimes called blackstrap, is the familiar dark, bittersweet syrup sold in grocery stores. The raw sugar crystals are then dried in fluidized bed dryers and cooled.
To produce the pure white sugar you buy in bags, raw sugar goes through an additional refining step at a separate facility, where it’s dissolved, filtered through activated carbon or bone char to remove color, and recrystallized.
How Sugar Is Extracted From Sugar Beets
Sugar beets look nothing like sugarcane. They’re stout, pale root vegetables grown in temperate climates like the northern United States, Europe, and Russia. The extraction process differs in its first step but converges with cane processing from evaporation onward.
After washing, the beets are sliced into long, thin strips called cossettes. These strips go into a diffuser, where hot water (kept between 122°F and 176°F) flows in the opposite direction of the cossettes, gradually dissolving the sugar out of the beet cells. The sugar-enriched water that comes out, called raw juice, contains 10 to 15% sugar. The spent pulp is pressed dry and typically sold as animal feed.
Purification uses a process called carbonatation: lime and carbon dioxide are added to the raw juice, forming calcium carbonate particles that trap impurities as they settle. From there, the juice follows the same path as cane juice through evaporation, vacuum pan crystallization, and centrifuging. One key difference is that beet sugar is refined in the same factory where extraction happens, rather than being shipped as raw sugar to a separate refinery. The end product is chemically indistinguishable from cane sugar.
Why Brown Sugar, Raw Sugar, and White Sugar Differ
The differences between common sugar varieties come down to how much molasses remains in or is added back to the crystals. White granulated sugar has had virtually all molasses removed during refining. Raw sugar (sometimes sold as turbinado or demerara) retains a thin coating of molasses on larger crystals, giving it a light tan color and a subtle caramel flavor. It’s less refined than white sugar but still about 96 to 99% sucrose.
Brown sugar is simply white sugar with molasses mixed back in. Light brown sugar contains less molasses; dark brown sugar contains more. This is why brown sugar is moist and clumpy compared to the free-flowing crystals of white sugar. Nutritionally, the small amount of molasses in brown sugar adds trace minerals like calcium and potassium, but the quantities are too small to make a meaningful dietary difference. Calorie for calorie, brown and white sugar are nearly identical.
Cane vs. Beet Sugar in Your Kitchen
Because both sources yield the same sucrose molecule at the same purity level, cane and beet sugar taste identical in everyday use. Most people could never tell them apart in coffee or a batch of cookies. Some bakers and candy makers report subtle differences in very high-sugar recipes like caramels or meringues, where trace compounds other than sucrose can affect browning or moisture. These differences are minor enough that the two are interchangeable for nearly all cooking purposes.
If your sugar package doesn’t specify “pure cane sugar,” it may be beet sugar or a blend. In the United States, about half of domestically produced sugar comes from sugar beets, grown primarily in Minnesota, North Dakota, Idaho, and Michigan. Imported sugar is almost exclusively from sugarcane, grown in tropical regions like Brazil, India, and Thailand.