Give two examples each of the following and their usefulness, if any, in our body.

1. Monosaccharides
2. Disaccharides
3. Polysaccharides

1. Monosaccharides:
   Examples — Glucose, Fructose
   Usefulness — Glucose provides an instant source of energy. Fructose enhances glucose metabolism and facilitates disposal of dietary carbohydrate load.
2. Disaccharides:
   Examples — Sucrose, Lactose
   Usefulness — Sucrose is the commercial sugar that is broken down into Glucose and Fructose by the body to provide the energy needed for physical and mental functions. Lactose is the natural sugar found in milk. Lactose acts as an excellent, slow release energy source and causes lesser tooth decay.
3. Polysaccharides:
   Examples — Cellulose, Glycogen
   Usefulness — Cellulose provides roughage for proper functioning of gut. Glycogen serves as a fuel reserve for the body. The controlled breakdown of glycogen and release of glucose increase the amount of glucose that is available between meals.