Why we need a water for our body???

Humans need to drink water to survive. Your body is approximately 60 percent water, your brain is 70 percent water, and your lungs are nearly 90 percent water. Each day, your body must replace 2.4 liters or about 2.5 quarts of water through ingested liquid and foods. Your body uses water in many ways. Water cushions and lubricates joints; nourishes and protects the brain, spinal cord and other tissues; keeps the body's temperature normal; and helps remove waste through perspiration, bowel movements and urination. Humans are composed mostly of water, which is not surprising when you consider that humans descended from single-cell organisms that originated in the oceans millions of years ago.

Water is more important for your body's survival than food. You can live without water for approximately one week, but you can survive without food for more than a month. Lack of water, or dehydration, reduces the amount of blood in your body, forcing your heart to pump harder in order to deliver oxygen-bearing cells to your muscles. In the early stages of dehydration, you can become dizzy, irritable and experience headaches. As dehydration progresses, you become clumsy and exhausted. Your eyesight fades. In the last stages of dehydration, you may feel nauseous and begin vomiting. Without water, you will enter a coma and die.

When you drink too much water, you can develop a condition known as hyponatremia, in which the excess water floods your body's cells, causing them to swell up. Your swollen brain cells then cause a wide range of symptoms, including a bad headache, nausea, cramps, mental confusion, convulsions, fatigue, coma and death. Hyponatremia has killed runners during marathons.

JUST DRINK OK!!! ITS GOOD FOR YOU