Dancing till you sweat or drinking alcohol causes your body to become progressively dehydrated. Having less water in our blood stream causes blood pressure to drop and headaches develop. Losing electrolytes through sweat can cause our muscles to cramp. Our cells become fatigued and we lose our ability to think clearly. Drying up our urinary system leaves us much more susceptible to cystitis or worse - kidney infections.If you’re getting a bit older, you’ll need to be particularly watchful of your fluid intake. Our body’s ability to conserve water deteriorates with age and we become less responsive to thirst sensations, meaning it's much more difficult to drink the right amount of water.