Which nutrient class includes glucose, fructose, and galactose?

The nutrient class that includes glucose, fructose, and galactose is monosaccharides. Monosaccharides are the simplest form of carbohydrates and consist of single sugar molecules. They serve as the building blocks for more complex carbohydrates and play a vital role in providing energy to the body. Glucose, one of the most important sources of energy for cells, is a primary monosaccharide, while fructose and galactose, which are also simple sugars, contribute to various metabolic processes.

Disaccharides, on the other hand, are formed when two monosaccharides bond together, such as sucrose (table sugar) which is composed of glucose and fructose. Polysaccharides are larger carbohydrate molecules made up of many monosaccharides linked together, such as starch and glycogen. Complex carbohydrates refer to a broader category that includes both oligosaccharides and polysaccharides, which are composed of multiple sugar units.

In summary, glucose, fructose, and galactose are all classified as monosaccharides due to their structure as single, simple sugar units.