Most of the carbohydrates we eat are combinations of 3 monosaccharides (???single-sugar???): glucose, galactose and fructose.Lactose is a disaccharide (???two-sugar???) made up of 1 galactose and 1 glucose.Cow milk has lactose, galactose, glucose and some other oligosaccharides (???few-sugar???, ~3-10 monosaccharides).