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OMEGA-3S & INFANTS
Throughout our lives we need small amounts of the polyunsaturates
found in vegetable oils. We eat plenty of these. Now it is clear
that we also need small amounts of fish oil polyunsaturates - omega-3s
- for proper brain and eye development.
When
babies are developing, their brain and nervous system begin accumulating
DHA, one of the fish omega-3s. They use it for building brain tissue,
for nerve growth and for the retina in the eye. Before birth, babies
get the DHA they need form their mother. After birth they obtain
it from breast milk.
Supplies
of DHA to the baby are most generous if the mother eats plenty of
fish. Babies fed formula may not get any omega-3s. These babies
have much less DHA in their nervous tissue than breast-fed babies
do. Their eye development may be affected as well.
At
the recent omega-3 conference in Washington, scientists showed that
premature infants have less DHA in their tissues than full-tern
infants. These babies can "catch-up" if they are fed breast milk
or fish-oil supplemented formula.
Scientists
believe that lack of omega-3s may result in delays or deficiencies
in nervous tissue development and possibly impaired vision. They
have shown that this happens to animals that do not obtain enough
omega-3s in their early life.
For
the best growth and development of our children, pregnant and nursing
women need adequate amounts of omega-3s. This means encouraging
pregnant and nursing women to eat fish regularly. It also means
that young children need to consume foods with omega-3s. Infant
and baby foods must include a source of omega-3s.
OMEGA-3S
IN THE EARLY YEARS
Just as it has become clear that omega-3s are necessary for human
development before and after birth, so we are finding out that omega-3s
are probably needed in the senior years as well.
Much
of the decline in health among older people occurs in tissues where
omega-3s are active - the eyes, blood vessels, skin, and the body's
immune system. Knowing that omega-3s are a vital part of the structure
of many tissues strongly suggests that throughout life we need these
fatty acids. They are best provided by eating fish often.
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WHAT ARE OMEGA-3S?
Omega-3s are polyunsaturated fatty acids found almost exclusively
in fish and shellfish. They have become a "hot topic" because they
can reduce our chance of having a heart attack - even if we already
have heart disease.
At
an international conference in Washington, D.C. in March 1990 the
world's most eminent researchers from more that twenty countries
convened to discuss their work on omega-3s. New findings from populations,
clinical trials and studies with patients made it clear that omega-3s
are vital from cradle to rocker.
We
discovered the protective effects of omega-3s by observing Eskimos
who eat large amounts of these polyunsaturated fatty acids in their
foods. Eskimos almost never develop heart disease. Because people
in Western countries have high rates of heart disease, researchers
look for the link and found omega-3s in fish oils. Now we know that
not only Eskimos, but Japanese, Scandinavians, Dutchmen and even
Americans who eat fish frequently have less heart disease.
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OMEGA-3S & HEART DISEASE
Heart disease claims at least half a million lives every year. It
restricts the activities of thousands who develop the disease in
mid life. We may be able to delay or prevent the onset of heart
disease by changing the way we eat. Of course, food alone cannot
overcome the ill effects of smoking, high blood pressure, overweight
and lack of exercise. But it just may help us live longer.
Dr.
Therese Dolecek from the Bowman Gray School of Medicine in Winston
Salem North Carolina has been studying the records of men in the
MRFIT study completed in 1982. In the MRFIT study nearly thirteen
thousand men at t high risk of heart disease were studied to see
if making changes in their habits could reduce heart disease. What
Dr. Dolecek found is that men who ate fish tow or three times a
week lived longer than those who did not. Not only did they have
less heart disease, they were less likely to die no matter what
the cause. Just as importantly, cancer rates were not any higher
among the fish eaters.
Longer
life is just what Dr. Michael Burr from the Medical Research Council
in Cardiff, Wales discovered when he advised his heart patients
to change their diet. "Eat at least two portions a week" he said.
"Try mackerel, herring, kipper, pilchards, sardines, salmon or trout."
Did it make a difference? Those who took his advice to "eat fatty
fish at least twice week" lived longer than those who did not eat
fish, In fact, fish-eaters were 29 percent likely to die from heart
disease.
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HOW OMEGA-3S WORK?
Omega-3s we know discourage many processes involved in heart disease.
They make blood clotting more difficult thereby preventing the attack
itself. They change how the walls of the blood vessels interact
with different cells in the blood. That relaxes our arteries, helps
them from becoming clogged and improves blood circulation in the
heart. They change the chemistry in our heart affecting heartbeat,
the flow of blood and chemical reactions in the blood vessels.
While
omega-3s can reduce heart disease,they have little affect on blood
cholesterol levels. They can, however, lower blood fats and blood
pressure which makes heart attack less likely. They also help keep
our arteries open by discouraging the build up of "plaque" in our
blood vessels.
The
omega-3s that benefit our heart are found almost exclusively n fish,
particularly river species like mackerel, salmon, tuna and sardines.
We should eat these kinds of fish at least twice a week to obtain
enough omega-3s for long lasting benefits.
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OMEGA-3S & HIGH BLOOD PRESSURE
Eating fish regularly can lower blood pressure. That is good news
for millions of Americans who take medication for hypertension.
Even better news is that fish oil provided along with certain hypertension
medication can prevent the undesirable side effects of the drug.
This is especially good news because the side effects tend to increase
the risk of heart disease.
Omega-3s
offer benefits in high blood pressure that help kidneys, blood.
They may eliminate the need for some or all drug treatments in some
people. Regularly eating fish can be an important way to improve
blood pressure and overall health.
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OMEGA-3S & OTHER DISEASES
Eating fish regularly is probably a wise step for most diabetics.
At the recent omega-3 conference in Washington DC evidence was presented
that fish can reduce the damage to the kidney that occurs in severe
insulin-dependant diabetes. Eating fish regularly offers the diabetic
the heart healthy benefits from omega-3s while minimizing the chances
of raising blood sugar levels. Taking large doses of fish oil capsules
however, may impair blood sugar control in some diabetics. For this
reason diabetics should always check with their doctor before taking
supplements of any kind.
Recent
studies showed that some people with rheumatoid arthritis had fewer
painful joints and less fatigue when they took fish oil. We know
that the omega-3s found in fish lessen the body's inflammatory processes
and help fight the disease. It is hoped that eating fish regularly
may reduce the discomfort of arthritis.
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PSORIASIS PATIENTS ALSO BENEFIT FROM OMEGA-3S
In a majority of psoriasis patients fish oil improved their condition
but did not eliminate all symptoms When fish oil was combined with
other medical treatments, most people responded favorably. In fact,
the presence of omega-3s offset the negative side effects of the
other medications. Research is underway to see if fish oil can be
used with other medications to relieve this distressing condition
without any uncomfortable or unsafe side effects.
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HOW MUCH FISH OR OMEGA-3 DO WE NEED?
If we look at how much fish it takes to make a measurable difference
in health, it appears that having rich-fleshed fish, on average,
about twice a week will bring about distinct health benefits. In
Dr. Burr's study among people who already had had a heart attack,
those who ate about 10 ounces of rich fish a week were the ones
who lived longer. Earlier work has indicated that eating fish two
or three times a week and keeping overall fat intake low, extends
life. The wisdom of including fish at least every week is no longer
doubted. Our body cannot make omega-3s from other sources and needs
them from food. Helping ourselves to fish is helping ourselves to
health.
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WHAT ABOUT FISH OIL CAPSULES?
Eating fish not only provides omega-3s but also lowers saturated
fat intake. Both effects lower the risk of heart disease. Eating
fish in place of fattier foods lowers the amount of saturated fatty
aids we consume. This is like getting two benefits for the price
of one.
Taking
fish oil capsules, a short cut to omega-3s, actually increase our
fat intake and has no effect on our saturated fat intake. The safety
of fish oil capsules has not been adequately established. Their
composition and level of refinement vary widely. Some contain undesirable
contaminants. Fish liver oils contain high levels of cholesterol
and vitamins A and D which are harmful in large amounts.
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