it is defined as a failure of the adaptive mechanics of an organism adequately the stimuli and stresses to which it is subjected, resulting in a disturbance in function or structure of some parts of the body

It is very important to stay hydrated. your body needs it for may things for cells, tissues, your organs and etc. water also with your temperature that way you don’t get a headache etc. i bet if you look it up there will be a lot of things you can learn.