You’ve likely heard health professionals say you need to up your water intake, but they don’t always ... that can throw a wrench into the day may include headache, irritability and, of course ...

Given around half of the daily intake of water comes from food ... He said: "Even if a male in his 20s has a water turnover of 4.2 litres per day, he does not need to drink 4.2 litres of water ...