Who is most at risk of dehydration?

• People whose water needs increase rapidly. For example, in those doing heavy manual work or exercise, particularly in hot weather, and for those who have fevers.s
• People who don't notice when they are thirsty or who don't drink when they are thirsty. This is a problem, particularly in elderly people whose attention wanders, and frequently in those who are very busy.
• People who quench their thirst with diuretic drinks. These are drinks which increase the body's production of urine. Examples are alcoholic drinks and drinks containing caffeine.