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Our bodies are approximately 60-65% water, but we need to keep that store of water replenished. Unsurprisingly, dehydrated brains are not good at thinking or focusing. Many professionals recommend that we drink 8 8-ounce glasses of water a day. (That is about half a gallon of water.) There is no absolute formula that fits everyone, however, so you may want to consult with your doctor at your next checkup. Milk is also a good hydration source.
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