I don’t understand why people drink so much water. It seems like everyone now carries a bottle and needs a swig every few minutes. People on trains, in swimming pools, walking around on an English spring day, students doing exams, checkout assistants ……..

We are savannah apes and carefully designed by Darwin to go without water for periods of time. Yet whenever you read about beauty, travel and health in papers or articles they insist you need to drink two litres a day! Poppycock!