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.
Water is the foundation of all life on earth. Every part of the body is dependent on water. The functions of our glands and organs will eventually deteriorate if they are not nourished with good clean water. Water is an excellent solvent and assimilation of vital nutrients and proteins occurs through absorption of water.