Monosaccharides

In addition to glucose, there are two other monosaccharides, galactose and fructose, most often in the human diet. 

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For plants and animals, glucose is the preferred fuel source. The human brain depends on glucose, except during extreme starvation conditions. 

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Galactose is a monosaccharide sugar. Galactose is found in avocados, sugar beets, and dairy products. The body also synthesizes it. Galactose is utilized for energy production in cells after converting to glucose. A galactose molecule unit linked with a glucose unit forms lactose, the natural sugar in milk. 

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Fructose is a monosaccharide that is primarily found in fruits. Fructose is among the most common monosaccharides in nature. It is also found in some drinks, cereals, and other products sweetened with fructose-containing corn syrup.