4.6
Carbohydrates, also known as sugars, are organic compounds containing carbon, hydrogen, and oxygen. They are essential macronutrients and readily usable sources of energy for the body.
Carbohydrates are categorized into monosaccharides, disaccharides, and polysaccharides, based on their size and chemical structures.
Monosaccharides are simple sugars consisting of monomers that act as building blocks for complex carbohydrates. They are readily soluble in water and body fluids.
For example, glucose, fructose, and galactose are primary monosaccharides that are important components of the human diet.
Next, disaccharides contain two monosaccharides linked together through a glycosidic bond. For example, sucrose or table sugar is composed of a glucose and a fructose monomer. Similarly, lactose, found in milk, is made from glucose and galactose.
Finally, polysaccharides are complex polymers comprising several monosaccharide units.
For instance, starch and glycogen are both polymers of glucose residues. However, they differ in their structural organization, water solubility, and their metabolism in humans.
While starch is a mixture of linear and branched glucan chains that is readily utilized by the body, glycogen is a multibranched polymer stored as a reserve carbohydrate.
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