Water helps your body to function correctly. Water is required for a number of chemical reactions and metabolic processes that take place in individual cells, tissues and organs. But if you don’t drink sufficient water, these reactions and processes will not function the way they’re supposed to. And this could affect your overall metabolism.
Sometimes, the body is not able to differentiate between hunger and thirst.
So if you feel hungry and tempted to snack on high-calorie food, have a glass of water first. It could be that you are, in fact, just thirsty and the glass of water would make you feel full and prevent you from consuming the extra calories.