How Much Water Do You Need to Drink?
You may not think about dehydration prevention while you’re out having fun swimming, hiking and sightseeing during your Arizona vacation. Yet, like sunburn, dehydration is an all too common occurrence in Arizona’s warm, sunny and dry climate. Though we feel solid, the human body is actually made up mostly of water - about 70% total. On an average day, we lose more than 10 cups of water just in the course of our basic bodily functions such as breathing, sweating and waste elimination. Dehydration happens when our bodies lose more water than they take in. Our bodies must have enough water and other fluids to carry out all of their bodily functions.  | | Every year, more than 250 people have to be rescued from Grand Canyon National Park’s trails - many of them due to dehydration and other heat-related illnesses | Not replacing that lost fluid can lead to serious medical conditions such as heat exhaustion and heat stroke. The causes of dehydration include prolonged bouts of vomiting and diarrhea, high fever, excessive sweating and exercise. However, many people often become dehydrated due to inadequate water intake during hot weather. Staying out under the hot sun too long or engaging in physical activities such as golf, hiking, cycling or even gardening during hot weather can cause you to lose water quickly. Arizona’s summer weather of high heat and relatively low humidity can rapidly lead to dehydration, although you can become dehydrated at any time of the year. One of the easiest ways to tell if you may be dehydrated is to check the color of your urine. If it's dark yellow or amber colored, you are most likely dehydrated. Other signs and symptoms of dehydration include: - a dry sticky mouth
- thirst
- decreased urine output
- headache
- dizziness or lightheadedness
- muscle weakness
- sleepiness or fatigue.
Severe dehydration symptoms include: - extreme thirst
- irritability and confusion in adults and extreme fussinessor sleepiness in infants and children
- very dry mouth, skin and mucous membranes
- lack of sweating
- little or no urination
- sunken eyes
- shrunken or dry skin without elasticity
- low blood pressure
- rapid heartbeat
- fever.
In the most serious cases, the victim may be delirious or unconscious. Severe dehydration is a life-threatening medical emergency and you must seek medical attention immediately. On a hot day in the Arizona desert, the average person loses about three gallons or more of water - just from sweating. Even small percentages of water loss can be harmful - or even fatal - if you do not replace the water lost from your body. But don’t let this scare you. With some basic precautions to prevent dehydration, you can enjoy Arizona’s outdoors all year, whether you'll be hiking the Grand Canyon or just cleaning up your yard.
Dehydration Prevention Tips
- How much water should you drink? Health professionals usually recommend drinking eight to ten 8-ounce glasses of water daily as a basic guideline, even if you stay indoors all day.
While this is the generally accepted minimum for dehydration prevention, each person is unique and some may lose fluids more rapidly than others. During periods of extreme heat or activity, you will need to drink more. - How do you know if you're drinking enough? The average, healthy adult produces about 6.3 cups of urine daily. So, if you're drinking enough so that you rarely feel thirsty and your producing about 6.3 cups of colorless or slightly yellow urine per day, your water intake should be adequate.
However, you may need to increase your fluid intake if you have an increased activity level, if you are in a hot or humid environment, if you are suffering from an illness or are pregnant or breast-feeding. - Drink an extra quart of water a day during a heat wave.
- Drink before you feel thirsty. You will become dehydrated before you think you are.
- Reducing activity during the hottest part of the day (10:00 a.m. to 4:00 p.m.) can really help with dehydration prevention. Just remember that you will still need to drink water even if you’re resting in the shade.
- Wearing sunscreen will help with dehydration prevention. Sunburns cause fluid loss and lessen your body’s ability to cool itself.
- Drink water before, during and after exercise or other exertion for dehydration prevention.
- Avoid drinking caffeinated or alcoholic beverages, which are dehydrating.
- Drink extra water when pregnant or nursing.
- Carefully monitor children for signs of dehydration. Monitor their water intake and make sure they are drinking.
- Check on elderly and disabled people during hot weather. They are often at greater risk for dehydration.
- Check your urine. It should be a colorless or a pale yellow, like the color of straw. If it’s scant or dark-colored, drink more water.
- During hiking or backpacking in hot weather, you’ll need more fluids for dehydration prevention. However, your body can absorb only about 1 quart of water per hour. So, drink about ½ to 1 quart of water or electrolyte replacement drink for every hour that you hike in the heat.
- If you must hike during hot weather, rest often, sitting in the shade. Wet your hat and shirt. Wear a banadana around your neck.
- Balance your food intake and water consumption. Don’t forget to eat. Hot weather may decrease your appetite but you need to replace the salts your body loses through sweat and exertion. Eat a salty snack when you take a drink.
- If you’re hiking at a higher altitude, you’ll need to drink more water for dehydration prevention because you lose more at altitude.
- DO NOT drink so much water that you repeatedly bloat yourself. Water intoxication, or hyponatremia, is caused by low sodium levels in the body. This condition is just as dangerous as dehydration and occurs when you drink too much water and don’t replace the salts your body lost during sweating.
Sources: Centers for Disease Control and Prevention; Maricopa County Department of Emergency Management; University Medical Center-University of Arizona; St. Joseph’s Hospital and Medical Center; Mayo Clinic; Grand Canyon National Park-National Park Service.
Note to the Reader: This page is intended for informational purposes only. It is not a substitute for professional medical advice, care or treatment. Always consult your physician. This information is not meant to cover every possible scenario or outcome. Before you travel, do your homework. YOU are solely responsible for your personal safety. Road conditions, weather and your personal knowledge and abilities all vary considerably. We cannot assume responsibility for you or anyone else's safety that reads and uses this information. Safety really comes down to common sense and being aware of your abilities and limitations. Always inquire locally before traveling. Always be conservative when planning your trips and routes. Back to Top of Page
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