The tragedy of waiting

to get thirsty hits home when it is realized that the sharpness of thirst perception is gradually lost as we get older. Hence the real cause of many elderly folks died of miserably dehydration dis-eases turned diseases. After 24 hours of water deprivation experiment, the elderly folks still do not recognize they are thirsty : "The important finding is that despite their obvious physiologic need, the elderly people (experiment subjects) were not markedly thirsty".