What's With The Number 8?

We've all been told at least once that we should drink 8 glasses of water a day. We hear it from our doctors, our parents, and other nosy people around us. Just yesterday, as I was filling up at my office water cooler, my coworker (let's call her Maureen) walked in and said, "Hope you're getting a solid 8 glasses today." I simply smiled and walked away, but inside I was a little miffed. Who was Maureen to comment on my drinking habits?

I don't know about you, but I've always wondered why 8 is the magic number. It seems like 8 glasses of anything in one day is a little much to ask. So I did a little digging on the subject, and here's what I found: there is no magic number.

Our bodies are 60% water, which is used for cleansing out toxins and carrying nutrients to our cells. We lose water every day through our breath, perspiration and (gross factor) urine and bowel movements, so it's essential that we replace the water in our body regularly. Surprisingly, 20% of the water can be replaced by our food intake, so the other 80% is replaced by the water we drink.

The amount of water people should consume is based on several factors. On average, the recommended intake is 8 eight-ounce glasses a day, which equals about 2 liters (that aforementioned 80%). However, men are actually advised to consume 13 cups a day. But don't gloat just yet, ladies. If you are pregnant or nursing, the recommended intake is around 11 cups a day. Oh, the joys of motherhood.

If you exercise regularly, and you should, you will need to consume 1.5 to 2.5 more cups a day. If you live in hot and humid weather or at a high altitude, factor in another 2 cups. And I'm sure you've heard this before, but if you're ill you'll need to increase your intake by at least 2 cups. I know, the numbers are adding up. But it's not as hard as you think to hydrate.

Although it's good practice to drink water with every meal and to keep it within reach throughout the day, you don't need to rely on drinking water to meet you fluid requirements. Many fruits and vegetables, such as watermelon and tomatoes, are 90% water. Beverages such as milk, juice, wine, beer and even coffee contribute to your water intake. Also, drinking tea or adding some flavor to cold water are great ways to add variety to your day.

So, while 8 is a nice, even number that's easy to remember, it's not magic. As long as you hydrate enough during the day so that you're rarely feeling thirsty, you're doing just fine. And tell those busybodies to mind their own business.