The practice of dehydration is some

The practice of dehydration is sometimes used in sports. Athletes may dehydrate in order to "make weight", competitive bodybuilders may dehydrate before a contest in order to look leaner and more muscular. This is a dangerous habit, as athletes and exercisers need more water than less active people. Reducing water in the body as little as 10% reduction can make you sick, and 20% can mean death. With water pollution on the rise, it is best to drink filtered or bottled water whenever possible.