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.
Why drinking water is important. More than two thirds of the human body consists of water. We require water for almost every function within our bodies, from flushing out toxins to digestion. But knowing how much water to drink can be a challenge, particularly when itâs warm or youâre doing more exercise than usual. Drink too little and itâs possible to suffer some potentially serious health problems. However, to complicate matters, drinking too much also carries health risks.