Summer Heat: Feel Your Best with Water (cont.)

According to the National Athletic Trainers' Association, says Kleiner, dehydration can impair your physical performance after less than an hour of exercise -- even sooner if you start working out in a dehydrated state. It can also increase your risk of developing symptoms of heat illness, such as heat cramps, heat exhaustion, and heat stroke.

It's not just athletes -- even the weekend variety -- who are dehydrated, says Jacob Teitelbaum, MD, author of From Fatigued to Fantastic!: A Manual for Moving Beyond Chronic Fatigue and Fibromyalgia. For even the sedentary he suggests: "Simply occasionally pay attention to your mouth and lips. If they are dry, you're thirsty and need more water."

Dehydration can be a serious problem for anyone, but children and older adults are at greater risk, according to the Gatorade Sports Science Institute. It offers these tips to avoid dehydration:

  • When exercising, drink early and often. Research shows exercise under warm or hot and humid conditions can cause dehydration in as little as 30 minutes. So it's important to consume fluids not only during and after exercise, but also before a workout or strenuous activity.
  • Don't wait until you're dehydrated to start drinking. Drinking in a dehydrated state can cause gastrointestinal distress.
  • The American College of Sports Medicine recommends that athletes drink enough fluid to fully replace sweat losses during their activity. At a minimum, drink 8 to 10 ounces of fluid every 15 minutes during exercise.
  • When active, don't rely on your sense of thirst. When you are hot and sweaty, your thirst mechanism can shut off quickly and you may not realize you need fluids. Drink on a schedule.
  • Check the color of your urine. If your urine looks like the color of apple juice, you are probably dehydrated. If it looks more like the color of lemonade, you are probably well hydrated.

Sugary sodas or even fruit juices are not the best ways to replace fluids. "Beverages with a high sugar content are actually dehydrating and should be avoided as a means of fluid replacement," says New York nutritionist Stuart Fischer, MD. That includes beer too, he points out.

If taste is an issue, Fischer recommends drinking flavored, zero-calorie mineral water, which mimics the taste of soda but contains no sugar.

California nutritionist Stella Metsovas likes to add mint or mint tea, lemon or lemon balm, or hibiscus tea to water to make it more "exciting," while fitness author Debbie Mandel recommends creating your own spa water by filling a pitcher with water, adding slices of fruit such as strawberry or peach, and refrigerating until the water is delicately fragranced and flavored.

Adding just a splash of fruit juice (cranberry, pomegranate, or blueberry are good choices because of their antioxidant properties) can also make water more palatable, says Jyl Steinback, cookbook/lifestyle author and designer of the health program Eat Right, Move More and Live Well.