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.
Drinking an adequate amount of water daily is important for overall good health because water is involved in and helps improve many bodily functions. These functions include digestion, absorption, circulation, and excretion. There are other more specific benefits for drinking water as well.