Water is the source of all life. No plant, animal or human can live without it. Researchers say water is important for us to live longer. They say people who drink a lot of water every day are healthier. They live longer than people who do not drink a lot of water. People who drink a lot get fewer health problems and old-age illnesses, like heart and lung disease. Adults who do not drink enough water are more likely to die younger, and to get old quicker.

Researchers looked at data from 11,000 hospital patients over 30 years. The patients had visited a hospital at least five times – three times in their 50s, and twice aged between 70 and 90. A researcher said: "Proper [water drinking] may slow down ageing and prolong a disease-free life." People should drink more water, juice, and fruit and vegetables with water in them. Half of people worldwide do not drink enough. An adult needs over 1.5 litres of water every day.