In general, foods are made up of carbohydrates, proteins, and fats, each of which provide a different number of calories: 1  Carbohydrates provide 4 calories per gram. 2  Proteins provide 4 calories per gram. 3  Fats provide 9 calories per gram.
Importance of Water. Water is used for various important purposes: Water in Agriculture. Water plays the most important role in agriculture. Agriculture is impossible without irrigation throughout the crop season. Irrigation ensures proper plant growth.
Although water does not provide energy in the same way carbohydrates and fat do, it plays a very important role in energy transformation. Water is the medium in which all energy reactions take place. Therefore, you need to drink a lot of water for health, stamina, fuel, and building muscle. Water is an important aspect of building muscle.