Carbohydrates are one of the three main macronutrients, along with proteins and fats, and they are a primary source of energy for the body.Cellulose, on the other hand, is a structural component of plant cell walls and cannot be digested by humans.It's worth noting that the consumption of carbohydrates should be balanced, as excessive intake of certain types of carbohydrates, particularly refined sugars and simple carbohydrates, can contribute to health issues like obesity, type 2 diabetes, and metabolic disorders.It is generally recommended to prioritize complex carbohydrates from whole grains, fruits, vegetables, and legumes, as they provide more nutrients and fiber.Common disaccharides include sucrose (glucose + fructose), lactose (glucose + galactose), and maltose (glucose + glucose).Additionally, carbohydrates play a role in various biological processes, such as cell signaling and immune system function.They are organic compounds made up of carbon, hydrogen, and oxygen atoms.Examples of monosaccharides include glucose, fructose, and galactose.1.2.3.