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Graphics, interviews, food experiments and commentary shows the importance of hydration and water in a healthy diet, particularly with an active lifestyle. It explains how the body is 60% water, how water is constantly lost from the body and needs to be replaced. We lose about 2-3 litres a day in wee and sweat. A case study of Olympic boxer Natasha Jonas illustrates how water is lost through sweating, and how rehydration is important to improve concentration and prevent fatigue or headaches. The sweating mechanism is explained and linked to thermoregulation (controlling the body temperature). An experiment shows how sweat contains salts of magnesium, calcium, potassium, and sodium.