Omega-3 Benefits and Facts
- Part 2
Introduction
Cardiovascular and Heart
Disease
Pregnancy and Infant Nutrition
Skin Conditions
Joint Health and
Arthritis
Other Diseases
Cardiovascular, Heart Disease and Omega-3 Fatty Acids:
There has been a strong inverse association between omega-3
fatty acids, cardiovascular diseases, and heart disease in
many observational studies. Some of the initial evidence
focused on the Inuit, an Eskimo population in Greenland,
who have a significantly lower mortality rate from cardiovascular
disease despite high total fat intake and similar cholesterol
levels when compared to the population of Denmark. The Inuit
diet consists largely of cold water fish that is high in
omega-3 fatty acids.
In 1996 the American Heart Association released its Science
Advisory, “Fish Consumption, Fish Oil, Lipids and Coronary
Heart Disease.” Since then important new findings have
been reported about the benefits of omega-3 fatty acids on
cardiovascular disease and overall heart health. These contain
evidence from randomized, controlled clinical trials. New
information has emerged about how omega-3 fatty acids affect
heart function (including antiarrhythmic effects), hemodynamics
(cardiac mechanics) and arterial endothelial function. These
findings are outlined in the American Heart Association November
2002 Scientific Statement, “Fish Consumption, Fish
Oil, Omega-3 Fatty Acids and Cardiovascular Disease.” The
American Heart Association also recommended the following: “People
who have elevated triglycerides may need 2 to 4 grams of
EPA and DHA per day provided as a supplement. Even the 1
gram/day dose recommended for patients with existing cardiovascular
disease may be more than can readily be achieved through
diet alone.”
The American Heart Association reported that omega-3 fatty
acids can reduce cardiovascular and heart disease risk. Although
the mechanisms responsible for omega-3 fatty acids’ reduction
of cardiovascular and heart disease risk are still being
studied, research has shown:
- Decrease risk of sudden death and arrhythmia
- Decrease
thrombosis (blood clot)
- Decrease triglyceride levels
- Decrease growth of atherosclerotic
plaque
- Improve arterial heart health
- Lower blood pressure, less
heart stress
- Overall decrease in heart disease
Since the association between omega-3 fatty acid intake
and cardiovascular disease was made in observational studies,
researchers have conducted several interventional clinical
trials that have shown decreased mortality from cardiovascular
disease, specifically myocardial infarction in the past two
decades.
One of the most well known studies, the GISSI-3 {Gruppo
Italiano per lo Studio della Sopravvivenza nell'Infarto Miocardio
(GISSI)-Prevenzione}, in which 11,324 people were given 1gram
of omega-3 fatty acids or control for 24 months. This large
study showed that persons given omega-3 fatty acid supplements
had a 45% decrease in risk of sudden cardiac death and a
20% reduction in all-cause mortality as well as a general
increase in heart health.
Meta-Analysis:
A meta-analysis recently published in the American Journal
of Medicine reviewed 11 clinical intervention studies published
between1966 and 1999. The relative risk ratio for patients
supplemented with omega-3 fatty acids as compared to controls
was 0.7 (P<0.001), 0.8 for nonfatal myocardial infarctions
(P=0.16) and 0.7 (P<0.001) for overall death.
What does this mean for you? Well, a meta-analysis groups
the results of several studies to make more meaningful conclusions.
If you eat a significant amount of fish or take an omega-3
fatty acid supplement you can decrease your risk of dying
by 30% or you risk of having a fatal heart attack by 20%.
That is a pretty persuasive argument to supplement your diet
with omega-3 fatty acids to fight heart disease!
Hypertension:
A meta-analysis on hypertension, that included 17 clinical
trials, concluded that supplementation with omega-3 fatty
acids reduced both systolic and diastolic blood pressure
in hypertensive patients. The effect on non-hypertensive
patients was minimal.
Arrythmias:
Several clinical interventions, including GISSI-3 mentioned
above, studies have shown that omega-3 fatty acids reduce
sudden death, especially in patients who have prior coronary
artery disease. The decrease in sudden death is partly
attributed to the reduction in fatal cardiac arrythmias.
Recent animal studies are close to elucidating the mechanism
behind this heart health benefit.
Supporting Heart Disease and Omega-3 References:
Cardiovascular disease risk factors and omega-3
fatty acid status in the adult population of James Bay
Cree. Dewailly,
Eric; Blanchet, Carole; Gingras, Suzanne; Lemieux, Simone;
Holub, Bruce John. Public Health Research Unit, CHUL Research
Center, Centre Hospitalier Universitaire de Quebec, Quebec,
QC, Can. American Journal of Clinical Nutrition (2002), 76(1),
85-92
Kromhout D, Bosschieter EB, Coulander CDL. The inverse
relation between fish consumption and 20-year mortality
from coronary
heart disease. N. Engl. J. Med. 1985; 312:1205-09
Shekell RB, Missell LV, Paul O, et al. Fish consumption
and mortality from coronary heart disease. N. Engl. J. Med.
1985; 313:820
Norell SE, Ahlbom A, Feychting M, et al. Fish consumption
and mortality from coronary heart disease. BMJ 1986; 293:426
Knapp HR, FitzGerald GA. The antihypertensive effects
of fish oil: a controlled study of polyunsaturated fatty
acid
supplements in essential hypertension. N. Engl. J. Med. 1989;
320:1037-43
Radack K, Deck C, Huster G. The effects of low doses
of omega-3 fatty acid supplementation on blood pressure
in hypertensive
subjects: a randomized controlled trial. Arch. Intern. Med.
1991; 151:1173-80
De Caterina R. Madonna R. Antiarrhythmia effects
of omega-3 fatty acids. A review. Italian Heart Journal: Official Journal
of the Italian Federation of Cardiology. 3(3 Suppl.): 297-308,
2002 Mar
Appel L.J. Miller ER 3rd. Seidler A.J. Whelton P.K. Does
supplementation of diet with 'fish oil' redue blood pressure?
A meta-analysis of controlled clinical trials. Archives of
Internal Medicine. 153(12): 1429-38, 1993 June 28
GISSI-Prevenzione Investigators. Dietary supplementation
with omega-3 polyunsaturated fatty acids and vitamin E after
myocardial infarction: results of the GISSI-Prevenzione trial. Lancet 1999; 354:447-55
Kromann N, Green A. Epidemiologic studies in the
Upernavik district, Greenland: incidence of some chronic
diseases 1950-1974. Acta. Med. Scand. 1980; 208:401-406
Bang H.O., Dyerberg J., Horne N. The composition
of food consumed by Greenland Eskimos. Acta. Med. Scand. 1976; 200:69-73
Heart Disease and Omega-3 Fatty Acids Information Links:
William S. Harris, Ph.D., and Lawrence J. Appel, M.D., M.P.H.
New guidelines focus on fish, fish oil, omega-3 fatty acids.
Online: American
Heart Association, ,2002
Children:
Heart Disease & Health (American Heart Association)
Health Claim for Omega-3 Fatty Acids and Coronary Heart
Disease (FDA)
Heart Disease and Omega-3s (American Heart Association)
Heart and Cardiovascular Diseases (National Heart, Lung,
and Blood Institute)
Search for Heart
Disease (American Dietetic Association)
This material has been provided for information purposes
only and should not be construed as recommendations. Please
consult your health care provider first if you have any health
problems or suffer from a cardiovascular or heart disease.
Soft-E-Care™ products that contain Omega-3
fatty acids:
Omega-T™
Coromega™
Next: Part 3: Pregnancy Nutrition
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