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The human body is 65% water. Simply put,
dehydration occurs as the result of excessive loss of water from the body, when
we lose more water than we take in. It's a bit more complicated than that since
the body loses valuable electrolytes as well. That's why sports drinks have
become so popular; they replenish electrolytes as well as just fluid.
Dehydration can be a major issue, both in and of itself and as a headache or
Migraine trigger. Many people mistakenly think it occurs only in hot weather and
that you're not dehydrated if you're not thirsty. Both of these misconceptions
lead to many cases of dehydration every year, some of them quite serious. Let's
take a look at dehydration, what it does to the body, how to treat it, and --
perhaps most importantly -- how to prevent it.
Dehydration basics:
- It takes an average of 64 to 80 ounces to
replace the water our bodies lose in 24 hours.
- Under normal circumstances, how much water
we need depends a great deal on the volume of our perspiration and urine
output.
- Our bodies' need for water increases under
circumstances such as:
- warmer weather or climate
- living at high altitudes
- increased physical activity
- when experiencing vomiting or diarrhea
- when fevered
- when you have a cold or the flu
- if you have a chronic disease such as
uncontrolled or untreated diabetes, kidney disease, alcoholism, cystic
fibrosis, or adrenal disorders,
- if you are taking some medications.
Always check your prescription information.
- during long air flights
- Losing as little as 1 to 2% of body weight
can result in dehydration.
- Losing 3 to 5% can negatively impact
reaction time, concentration and judgment.
- Losing 9 - 15% results in severe
dehydration and is life-threatening.
Symptoms of dehydration:
- Excessive thirst
- Fatigue
- Muscle weakness
- Headache (or, in the case of Migraineurs,
Migraine)
- Dizziness
- Less frequent need to urinate and
decreased output
- Darker colored urine (should be nearly
clear to pale yellow)
- Confusion
- Increased heart rate and respirations
- Skin that doesn't snap back when pinched
and released
- Children may exhibit additional symptoms:
- Absence of tears when crying
- No wet diaper for three hours or
longer
- Irritability
- Lethargy
- Fever
Treating dehydration:
Dehydration should be confirmed by your doctor.
Caught early, after confirming with your doctor, dehydration can usually be
treated at home. Especially with children, your doctor's suggestions for
treatment may vary depending on the cause and severity of the dehydration.
Common treatments include:
- Mild dehydration: rehydration by drinking
fluids including sports drinks, which rehydrate by providing not only fluid,
but also electrolytes and salt. In children, products such as Pedialyte may
be recommended as it also contains carbohydrates to help absorption in the
intestinal tract. Coffee, tea, and soda should not be used for dehydration
as the caffeine in them can actually be dehydrating.
- Moderate dehydration: rehydration may
suffice, but IV fluids may be required.
- Severe dehydration: Immediate action must
be taken, treating the situation as a medical emergency. Hospital treatment
is necessary for IV fluids to rehydrate more quickly and efficiently and to
allow observation.
Prevention, the best treatment:
Obviously, it's better to prevent dehydration.
Here are some steps you can take:
- Drink plenty of fluids and eat foods high
in water. Fruit contains the most water, followed by vegetables, meat, then
grains with the least.
- Choose your beverages wisely. Caffeine and
alcohol can be dehydrating. For some people, too much fruit juice can cause
diarrhea, which can be dehydrating.
- If you're planning a day with more
significantly exercise than usual, begin hydrating the day before.
- Sports drinks can help maintain
electrolyte balance, but be aware of the sugars in them.
- Plan outdoor activities for cooler parts
of the day.
- If you're organizing outdoor activities,
provide shaded areas.
- When you're ill, be sure to continue
drinking fluids, and get additional fluids if you have a fever or are
vomiting or have diarrhea. Call your doctor for help with vomiting or
diarrhea if necessary.
Summary:
Learning to prevent and to recognize
dehydration are essential. Don't let dehydration ruin your fun or make you more
ill. Remember to take in as much fluid as you're losing each day.
_____________
Resources:
"Dehydration
Overview." MayoClinic.com.
"Dehydration
and Heat Stroke."The Ohio State University Medical Center.
"Dehydration."
UPMC, University of Pittsburgh Medical Center.
Worthington-Roberts, Bonnie, M.S., Ph.D. "Nutrition."
Microsoft Encarta Online Encyclopedia.
Medical review by
John Claude Krusz, PhD, MD
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© Teri Robert, 2010. Last updated July 29, 2010.
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