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.
The Importance of Water for Health. Water is important for our body and health. It is important because almost all of part of human body such as brain, blood, cells, muscle, etc contain water. Between 60 to 70% of our body is made from water. We need water to keep our body work properly.