People say water can improve health and memory. But now some experts say that to think drinking water equals health is taking things too far and that hydration (水合作用) is about the balance between electrolytes (电解质) like sodium and the water in your body.
Then how much water do you need to drink? Many say you should drink eight 8-ounce glasses of water a day. Not so, some experts say. A 200-pound person who hikes 10 miles in the heat needs more water than a 120-pound office manager in a temperature-controlled building.
Someone with a heart condition or kidney stones has one level of need. A person taking diurelie drugs (利尿药) may need a different amount of water. You may need to change the amount you are drinking if you have been ill with vomiting or diarrhea.
Water is a better choice than sugary sodas or fruit juices. One popular idea is that caffeine or alcohol will make your body lose much water. But one study showed the effect is not significant. You also get water from what you eat. Fruits, vegetables, and soups all add to the intake of water. Your body will tell you if you are hydrated enough. You don't have to think about it or add up the ounces you drink.
Electrolytes are essential minerals. Some sports drinks ads say you need to add electrolytes to stay healthy. But some experts say that your body produces electrolytes. You may need more water if you exercise a lot during the heat of the day. Otherwise, most people get enough electrolytes from food.
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A. Just drink when you are thirsty. B. They are vital to many functions in the body. C. It gives you more energy and makes you look good. D. Instead, your body and the activities you attend matter. E. It is also necessary to set a timetable about when to drink water. F. The amount of water you need in a day also depends on your health. G. But when it comes to hydration, any drink can add water to your system. |
