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.
You need water to digest your food and get rid of waste, too. Water is needed for digestive juices, urine (pee), and poop. And you can bet that water is the main ingredient in perspiration, also called sweat. Besides being an important part of the fluids in your body, water is needed by each cell to function normally. Your body doesn't get water only from drinking water. Any fluid you drink will contain water, but water and milk are the best choices. Lots of foods contain water, too.
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.