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You hear the "rules" thrown around all the time: Drink eight glasses of water a day. Drink half your body weight in water a day.
If you're already thirsty, it's too late, you're dehydrated.
Being well-hydrated improves your ability to fight illnesses because water is part of lymph fluid, a part of your immune system.
You're also less likely to feel day-to-day malaise if you're hydrated since being dehydrated can cause symptoms such as headaches, back pain, muscle weakness, fatigue and dizziness.
