Carbohydrate, Sugar, and Sugars: Untangling the Terms

Similar words on a label mean different things. The relationship is nested.

Largest to smallest

Carbohydrate The outer category. Sugar plus dietary fiber.

Sugar Carbohydrate minus dietary fiber. Includes sugars, but also starch and sugar alcohols.

Sugars The subset consisting of monosaccharides (glucose, fructose) and disaccharides (sucrose, lactose). Closest to what most people mean by sugar.

So: carbohydrate > sugar > sugars.

"Zero sugars" does not mean zero sugar

The nesting explains the claim.

A product declaring zero sugars can still contain sugar in the form of starch, sugar alcohols, or dextrin. If you are managing carbohydrate intake, sugar is the line to read, not sugars.

Sugar disclosure is optional, so many labels omit it.

Estimating when it is absent

Subtract dietary fiber from carbohydrate for a close approximation.

If fiber is not listed either, treat the carbohydrate figure as an upper bound.

Matcha is a special case. Composition tables show 38.5 g of the 39.5 g carbohydrate as fiber, so the matcha portion contributes almost no sugar. In sweetened matcha, sugar corresponds closely to the sugar that was added.

Where dextrin sits

Dextrin appears frequently on powdered drink labels. It is produced by breaking down starch and contributes little sweetness.

It does count as sugar in the nutritional sense. A "zero sugars" product containing dextrin is not sweet from it, but the carbohydrate is there.

Marketing terms have no fixed meaning

Reduced sugar, lightly sweetened, and similar phrases are comparative and unregulated in any precise sense.

For actual quantities, the nutrition panel and the ingredient order are what to consult.