Foods are classified into three groups on the basis of the functions they perform in our body. Name these three groups, and briefly state their functions. Also give two sources of each.

The three groups into which the foods are classified are:

1. Energy-giving foods — They are made up of carbohydrates and fats. Carbohydrates provide us with instant energy, while fats are stored as energy resources. Its sources are:
   
   1. Rice
   2. Potato
   3. Fats
2. Body-Building foods — Proteins are considered to be body building food. Such foods help in the growth and repair of damaged cells and tissues. Its sources are:
   
   1. Pulses
   2. Milk
3. Protective foods — They are mainly vitamins and minerals. Minerals are needed for their specific roles in the body. Vitamins are needed for the normal functioning of various body processes. Its sources are
   
   1. Fruits and Vegetables
   2. Dairy products