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 Role of water in dieting. Drinking water may be the most important piece to the weight loss puzzle. Before we learn the role water has in dieting, let us briefly go over the importance of water for our body in general. Water helps eliminate toxins through urination, carries nutrients to cells and prevents dehydration.