Dehydration is when your body is losing more fluids than it is taking in. Often heat related, its other names are "heat stress", "heat exhaustion," "heat cramps," and "heat stroke," but it can occur even in cold temperatures. It's a common problem, especially among young children, people exercising, and sick people. Thankfully, it's usually fairly preventable. Steps 1 Prevent it by drinking lots of water daily! By the time you feel thirsty, you are already dehydrated. Thirst can signal a water loss of 1% of body weight. Light-headedness can occur with as little as a 2% water loss. Water contains no calories and is great for your health in other ways. The amount of water you need is dependent on body weight. Hospitals use a formula to compute water intake needs, because even a patient in a coma needs water! For an adult weighing 150#, 8 oz. of water every hour for 8-10 hours is about right, in a temperate climate, with a sedentary l...
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