While drinking a lot of water through the day doesn't hugely affect a
healthy person, having more than 1 L water per hour can strain the
kidneys and the heart. If you're sweating, or retaining water in your
body due to a medical condition, overhydration can lower the sodium and
potassium levels dangerously. This can cause muscle cramps and swell up
brain cells fatally and even lead to death.
Side Effects Of Drinking Too Much Water
All your life, you must have heard you need to drink plenty of water to
avoid dehydration – 8 glasses, each of 8 oz, to be precise. But there is
such a thing as water intoxication, caused by drinking too much water
too frequently. Usually, in a healthy person, the kidneys can excrete
around 6 gallons (about 22.7 L) of water a day,
but only close to 1 L per hour. So drinking more than 1 L water per
hour consistently can cause overhydration. The most common side effect
is, of course, excessive urination, but there are other dangerous side
effects. While healthy people may not show these side effects
immediately, endurance athletes, people with kidney and heart problems,
people on drugs like ecstasy, and infants with immature kidneys will
have a lower threshold. Here’s a look at the side effects of drinking
too much water.
1. Swells Up Your Cells
Your body has
sodium and potassium ions that act as electrolytes in the body and
maintain fluid balance between your cells and your blood. When there is
excess water in the blood and a higher amount of salts and ions within
the cells, water rushes into the cells, swelling them up. This is
especially dangerous for neurons or nerve cells in the brain, where
space is restricted by the skull. The result can be headaches, seizures,
brain injury, coma, and even death.
2. Lowers Sodium Levels Abnormally (Hyponatremia)
Drinking
too much water can also upset your body’s careful balance of sodium.
This critical mineral should hover between 135 and 145 mEq/L. But when
it drops below 135 mEq/L, a condition called hyponatremia develops. This
too results in water from the blood stream flowing into the cells,
making them swell.
Hyponametria is more likely in athletes who
lose a lot of sodium through sweat. Drinking water in this condition
only dilutes the sodium density further. Hyponatremia has been seen to
even cause death in athletes.
You’ll
start to notice mild symptoms as sodium levels dip below 120
mmol/liter. Typically, symptoms like confusion or muscle cramps will be
more visible under 110 mmol/liter. But when levels drop to 90 to 105
mmol/liter, your symptoms will probably become more severe. At first,
you might feel drowsy, but it may result in a coma. Now, if you’ve had a
lot of water in a very short time, the progression from mild to severe
may happen pretty fast.
3. Lowers Potassium Levels Abnormally (Hypokalemia)
Overhydration
can also lower potassium levels in the body. Loss of potassium may
cause hypokalemia, the symptoms of which are vomiting, low blood
pressure, paralysis, nausea, and diarrhea.
This effect may be even more pronounced if you are on anti-diuretic medicines like vasopressin.
The medicine is the synthetic form of the hormone vasopressin, which
helps retain water in the body, especially in times of stress such as
physical exertion. So if your body is already on a water-retention mode
and you keep drinking more water, the result is disastrous.
4. Causes Muscle Cramps
As
mentioned before, consuming too much water will lead to a drop in your
body’s electrolyte levels. The resulting fluid imbalance also affects
your muscular function and could lead to muscle spasms and cramping. If
you’re involved in high-endurance activities, it’s important to not only
drink more water but also to replenish your electrolytes with sports
drinks.
5. Overwhelms The Kidneys
As
you know, kidneys help filter toxins from blood. The first stage of
filtration happens in a cluster of capillaries at the end of each
nephron (the basic functional unit of kidneys). The toxins are then
flushed out with urine.
Overhydration can affect the glomeruli
because your kidneys need to work overtime to filter the extra water
from your blood. So when you drink liters of water within an hour, your
kidneys get overwhelmed. Drinking up to 800 to 1000 ml of water in an
hour should be fine if you’re in otherwise normal health.
Overhydration is particularly dangerous when you have kidney
problems. Researchers suggest that it can actually cause chronic kidney
disease progression. It may also spark an increased risk of developing
cardiovascular disease.
6. Strains The Heart
Your
body has an effective water absorption mechanism. Almost 80% of the
fluids you drink is absorbed by the small intestine through a process
called osmosis. Water then enters the blood stream, thereby increasing
the overall volume of your blood. Drinking too much water can put undue
strain on your heart due to the increase in blood volume and also lead
to seizures in some cases.
Kidney function and heart health are
also closely related. Patients with congestive heart failures or other
heart issues that also affect the kidneys tend to retain more water in
the body, compounding the problem. In their case, drinking too much
water can stretch the heart muscle fibers and result in heart failure.
7. Makes You Feel Tired
Excretion of fluids is mainly the
function of your kidneys. When you drink more water than is needed by
your body, it’s your kidneys that are strained the most. They need to
work hard to remove excess water, which can lead to a stress reaction
from your hormones. This could make you feel tired or fatigued.
Moreover, the dilution of electrolytes could trigger exhaustion.
Drinking Chlorinated Water For A Long Time Can Cause Cancer
As
much as we would to think that tap water is safe to drink, the fact
remains that most drinking water in the United States is treated with
chlorine to disinfect it. Drinking too much of chlorinated water over a
period of time means increased intake of chlorine. Studies have shown
that the risk of bladder cancer increased with intake of tap water and
beverages made with tap water.
How Much Water Should You Drink?
But
how much you need to drink really depends on your age, gender, body
weight, activity levels, metabolism, and medication as well as
environmental conditions. People
in temperate climates and with little physical activity may not need
the 8 glasses of water daily. The doctor
recommends limiting intake to 6 to 8 glasses of water, totaling about
1.2 liters a day, especially when you drink other fluids and water-filled foods.
The
general rule to follow is to watch out for your body’s thirst signals.
In a healthy person, the color of the urine is a good indicator as is the number of times you pee in a day.
On hot and humid days and on days that you do strenuous exercise, drink
1.5 to 2.5 cups more, preferably with some electrolytes to balance the
salts. But make sure you drink the water in small quantities through the
day and not at one go.
THIS IS ONLY FOR INFORMATION, ALWAYS CONSULT YOU PHYSICIAN BEFORE
HAVING ANY PARTICULAR FOOD/ MEDICATION/EXERCISE/OTHER REMEDIES.
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