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Lactose, or milk sugar, is a disaccharide made of two simple sugars – glucose and galactose – in a 1:1 ratio.

For example, table sugar, honey, corn syrup, maple syrup, brown sugar and molasses contain easily digested disaccharides and no fiber, so they are fast carbs.

Sugar is a disaccharide that ends up being two different monosaccharides in your gut.

First off, lactose is a disaccharide, meaning it's a sugar made of two simple sugar molecules – glucose and galactose.

The most abundant component in dried samples of breast milk is lactose, which provides nutrition for the infant, although many bacterial taxa can also digest this disaccharide.