Water loss in your body is though respiration (breathing), sweating, and passing urine.
As soon as you have posted this in diet and weight loss, I am guessing this is because you wish to lose weight.
If this is the case, it may be best to have a calorie controlled diet, and have regualr exercise, around an hour a day.
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The body loses water in many ways. Urinating and sweating are two ways the body loses water. The body even releases water with each breathe.