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Messages around how much water we should drink are often confusing. Dr Mark Porter unpicks the myths. He finds that optimum fluid intake varies greatly from one person to the next and discovers the best way of establishing what's right for you.

Mark talks to Bridget Benelam, nutrition scientist and author of a new report into hydration and health; Dr Nick Sculthorpe, Senior Lecturer in Exercise Physiology at the University of Bedfordshire; Detlef Bockenhauer, Consultant Paediatric Nephrologist at Great Ormond Street Hospital, London; John Brewer, Professor of Sport at the University of Bedfordshire, and Tom Sanders, Professor of Nutrition & Dietetics at Kings College Hospital London.

Producer: Erika Wright.