In the group of men that were studied, even mild dehydration was found to cause reduced performance in areas of vigilance and working memory. These men also reported feeling fatigue, tension, and anxiety as a result of dehydration. Interestingly, researchers pointed out that symptoms of dehydration were "substantially greater in females than in males, both at rest and during exercise." This particular study is published in the British Journal of Nutrition (November 2011).
Now that you are reminded just how important staying hydrated can be, are you feeling a bit thirsty? On average, most people need to drink at least half their body weight in ounces daily, more in cases of physical activity or on hot summer days. As an example, a person that weighs 150 pounds generally needs a minimum of 75 ounces every day.
One of my favorite options for a high quality chemical-free drinking water is that which is filtered by reverse osmosis (RO). Many people choose to invest in a whole house RO system, but you can also stick with a simple RO filter that attaches to your kitchen faucet. Some people, who are not bothered by a more tedious option, will buy a few 3 or 5-gallon reusable containers that can be filled up at the purified water station at the local grocery store.