Krill yaginin kolesterol uzerindeki etkileri

Evaluation of the Effects of Krill Oil on the Clinical Course
of Hyperlipidemia
Roxandra Bunea M.D.
1
, Khassan El Farrah M.D., M.Sc.
2
, Luisa Deutsch
M.D., M.Sc.
2
1 Assistant Professor, Department of Internal Medicine, McGill University; Riverview
Medical Center, Montreal, Quebec, Canada.
2 JSS Medical Research, Montreal, Quebec, Canada.
Altern Med Rev 2004;9(4):420-428

Evaluation of the Effects of Krill Oil on the
Clinical Course of Hyperlipidemia
Ruxandra Bunea, MD; Khassan El Farrah, MD, MSc; Luisa Deutsch, MD
Abstract OBJECTIVE: To assess the effects of krill oil on blood lipids, specifically total
cholesterol, triglycerides, low-density lipoprotein (LDL), and high-density lipoprotein (HDL).
METHODS: A multi-center, three-month, prospective, randomized study followed by a
three-month, controlled follow-up of patients treated with 1 g and 1.5 g krill oil daily. Patients with
hyperlipidemia able to maintain a healthy diet and with blood cholesterol levels between 194 and
348 mg/dL were eligible for enrollment in the trial. A sample size of 120 patients (30
patients/group) was randomly assigned to one of four groups. Group A received krill oil at a body
mass index (BMI)-dependent daily dosage of 2-3 g daily. Patients in Group B were given 1-1.5 g
krill oil daily, and Group C was given fish oil containing 180 mg eicosapentaenoic acid (EPA) and
120 mg docosahexaenoic acid (DHA) per gram of oil at a dose of 3 g daily. Group D was given a
placebo containing microcrystalline cellulose. The krill oil used in this study was Krill Oil ,
provided by Technologies & Bioresources, Laval, Quebec, Canada. OUTCOME MEASURES: Primary
parameters tested (baseline and 90-day visit) were total blood cholesterol, triglycerides, LDL, HDL, and
glucose. RESULTS: Krill oil 1-3 g/day (BMIdependent) was found to be effective for the reduction of
glucose, total cholesterol, triglycerides, LDL, and HDL, compared to both fish oil and placebo.
CONCLUSIONS: The results of the present study demonstrate within high levels of confidence
that krill oil is effective for the management of hyperlipidemia by significantly reducing total
cholesterol, LDL, and triglycerides, and increasing HDL levels. At lower and equal doses, krill oil
was significantly more effective than fish oil for the reduction of glucose, triglycerides, and LDL
levels. (Altern Med Rev 2004;9(4):420-428)
Introduction
The balance of polyunsaturated essential fatty acids (PUFAs) in the body is critical for the maintenance of healthy
cell membranes and hormone regulation. During the last few decades the fatty acid content of the U.S. diet has
shifted so it now contains much higher levels of omega-6 and less omega-3 fatty acids. When long-chain omega6
fatty acids predominate in the phospholipids of cell membranes, the production of pro-inflammatory type-2
prostaglandins (PGs) and type-4 leukotrienes (LTs) are encouraged; whereas, the presence of omega-3 fatty acids
promotes the production of anti-inflammatory PGs and LTs.
1,2
Ruxandra Bunea, MD – Assistant Professor, Department of Internal Medicine, McGill University; Riverview
Medical Center, Montreal, Quebec, Canada. Correspondence address: 1586 Ave des Pins O. #302, Montreal, Quebec, Canada H3G 1B4.
Khassan El Farrah, MD, MSc – JSS Medical Research, Montreal, Quebec, Canada.
Luisa Deutsch, MD – JSS Medical Research, Montreal, Quebec, Canada.
Page 420 Alternative Medicine Review ◆ Volume 9, Number 4 ◆ 2004
Copyright©2004 Thorne Research, Inc. All Rights Reserved. No Reprint Without Written Permission

Omega-6 fatty acids, mainly arachidonic
acid, have been shown to initiate an inflammatory
process by triggering a flux of inflammatory PGs
and LTs.
3,4
Omega-3 fatty acids, mainly
eicosapentaenoic acid (EPA) and
docosahexaenoic acid (DHA), compete with the
omega-6 species for the enzyme prostaglandin
synthetase. Omega3 fatty acids trigger secretion
of less potent 5-series LTs and anti-inflammatory
PGs of the 3 se
).
4-9
ries (PE3
, PI3
and thromboxanes-A3
Consequently,
supplementation with EPA and DHA promotes
the production of less potent PGs and LTs,
resulting in a decrease in the formation of inflam-
matory mediators.
10-13
The exact mechanism of action by which
omega-3 fatty acids favorably modify cardiovas-
cular disease and associated disorders is not yet
fully confirmed. Evidence suggests an increased
intake of EPA and DHA results in an increase of
EPA and DHA in tissue, cellular lipids, and circu-
latory lipids.
14
In parallel, they result in a simulta-
neous reduction of omega-6 fatty acids in the
body.
14
This fatty acid shift is predominantly
marked in cell membrane-bound phospholipids
and results in alteration of the physicochemical
properties of cell membranes. This favorably
modifies cellular functions, including cell signal-
ing, gene expression, biosynthetic processes, and
eicosanoid formation.
15
Human studies have revealed the ability
of EPA and DHA to significantly reduce circulat-
ing levels of blood triglyceride and very low-den-
sity lipoprotein (VLDL), which have been asso-
ciated with increased risk of cardiovascular dis
ease.16,17
Krill oil is extracted from Antarctic krill,
Euphausia superba, a zooplankton crustacean
rich in phospholipids carrying long-chain
omega-3 PUFAs, mainly EPA and DHA. Krill oil
also contains various potent antioxidants,
including vitamins A and E, astaxanthin, and a
novel flavonoid similar to
6,8-di-c-glucosylluteolin, but with two or more
glucose molecules and one aglycone.
Krill oil has a unique biomolecular pro-
file of phospholipids naturally rich in omega-3
fatty acids and diverse antioxidants significantly
different from the usual profile of fish oils. The
association between phospholipids and
long-chain omega-3 fatty acids highly facilitates
the passage of fatty acid molecules through the
intestinal wall, increasing bioavailability and
ultimately improving the omega-3:omega-6 fatty
acid ratio.
18,19
Materials and Methods
A 12-week, double-blind, randomized trial was
conducted comparing krill oil to high EPA and
DHA (3:2 ratio) fish oil and placebo. Eligible
patients were 18-85 years and had at least a
six-month diagnosis of mildly high to very high
blood cholesterol (193.9-347.9 mg/dL) and
triglyceride levels (203.8-354.4 mg/dL). Patients
with familial hypercholesterolemia, severely high
cholesterol (>349 mg/dL), pregnancy, known or
suspected allergy to fish or seafood, known
alcohol or drug abuse within the previous year,
known coagulopathy or receiving anticoagulant
therapy, or co-morbidity that would interfere with
study results were excluded from the study.
Enrolled patients were randomly assigned to one
of four groups:
Group A: Krill oil (2-3 g once daily) Body
Mass Index (BMI) < 30 – 2 g/day BMI > 30 – 3
g/day
Group B: Krill oil (1-1.5 g once daily)
BMI < 30 – 1 g/day BMI > 30 – 1.5 g/day
Follow-up 500 mg/day for 90 days
Group C: Fish oil (3:2) containing 180 mg
EPA and 120 mg DHA per gram (3 g once daily)
Group D: placebo (3 g once daily)
Patients were allowed to continue lipid-lowering
medications at the usual daily dose and asked to
report any change in dosage. Natural health
products were discontinued for a two-week
washout period prior to study initiation and there-
after for the study duration. Patients were asked to
record concomitant medications taken daily.
Alternative Medicine Review ◆ Volume 9, Number
4 ◆ 2004 Page 421
Copyright©2004 Thorne Research, Inc. All
Rights Reserved. No Reprint Without Written
Permission

Table 1. Results of Krill Oil (1.0 g/day) on Lipids
Statistical
Rationale and Analysis
A sample size of 120 patients (30 patients/group) provided 90-percent power to detect a 15-percent change in total
cholesterol from baseline to three months. Within-group differences reflecting changes over time
for the same patient were assessed for statistical significance with the Paired Student’s t-test. Between-group
differences were assessed with planned comparisons of one-way analysis of variance.
Results
One-hun-Theprimary parameters tested were dred-twenty patients with a mean age of 51 years blood glucose,
cholesterol, triglycerides, low-den(standard deviation 9.46) and ranging between 25 sity lipoprotein (LDL), and
high-density lipoproand 75 years were enrolled in the trial. BMI, a tein (HDL). Fasting blood lipids and glucose
were tool indicating weight status in adults, was calcuanalyzed at baseline as well as 30 and 90 days lated according
to the metric formula ([weight in after study initiation for all groups, and at 180 days kilograms/(height in
centimeters) x (height in cenfor the 30 patients in Group B. timeters)] x 10,000).
20,21
Of the 120 patients enrolled, 30
(25%) had moderate-to-severe obesity, with a BMI higher than 30. Sixty-four (53%) subjects were overweight, and
26 (22%) were normal weight, with a BMI between 25 and 30 and lower than 25, respectively. Women had a higher
w ◆ Volume 9, Number 4 ◆ 2004

(28.25.1) compared to men (25.43.9) (p<0.001). Among the 60 patients in the two groups receiving krill oil,
42 (70%) had a BMI of 30 or less. In Group A, 19 patients received 2 g krill oil daily and the remaining 11
received 3 g daily. In Group B 23 patients were treated with a daily dose of 1g
krill oil and 7 with 1.5 g. All patients in Group B continued for an additional 90 days with a maintenance dose of
500 mg krill oil daily.
Baseline analysis of demographic criteria, laboratory data including total cholesterol and triglyceride levels,
comorbidity, and concomitant baseline of 247 mg/dL and 251 mg/dL to 203 mg/medication at baseline showed no
significant difdL (p=0.000) and 206 mg/dL (p=0.000), correferences among the four groups (p=0.102-0.850).

spondingly (Tables 3 and 4). In comparison, people After 12 weeks of treatment, patients re-receiving 3 g fish
oil had a mean reduction in toceiving 1 or 1.5 g krill oil daily had a 13.4 -per tal cholesterol of 5.9 percent, from a
baseline 231cent and 13.7-percent decrease in mean total chomg/dL to 218 mg/dL (p=0.000) (Table 5). Those
lesterol, from 236 mg/dL and 231 mg/dL to 204 enrolled in the placebo group showed a 9.1- per
mg/dL (p=0.000) and 199 mg/dL (p=0.000), recent increase in mean total cholesterol, from 222spectively (Tables 1
and 2). The group of patients mg/dL to 242 mg/dL (p=0.000) (Table 6). treated with 2 or 3 g krill oil showed a
significant respective reduction in mean total cholesterol of 18.1 and 18 percent. Levels were reduced from a
Alternative Medicine Review ◆ Volume 9, Number 4 ◆ 2004 Page 423

Table 5. Results of Fish Oil (3.0 g/day) on Lipids
blood levels decreased from 122 mg/dL at baseline to 118 mg/dL (p=0.141) after 12 weeks. Patients receiving
placebo showed a negative effect, with a 13-percent increase in LDL levels, from 137 mg/dL to 154 mg/ dL
(p=0.000). HDL was significantly increased in all patients receiving
Table 6. Results of Placebo on Lipids
krill oil (p=0.000) or fish oil (p=0.002). HDL levels increased from 57.2 mg/dL to 82.4 mg/dL (44% change) at
krill oil 1 g/day; 58.8 mg/dL to 83.9 mg/dL (43% increase) for krill oil 1.5 g/day; 51 mg/dL to 79.3 mg/dL (55% in-
crease) at krill oil 2 g/day; and from 64.2 mg/dL to An analogous effect on LDL levels was 102.5 mg/dL (59%
increase) at a daily krill oil observed in all groups. Krill oil at a daily dose of dose of 3 g. Fish oil taken at 3 g/day
increased1 g, 1.5 g, 2 g, or 3 g achieved significant reduc-HDL from 56.6 mg/dL to 59.03 mg/dL (4.2% intions of
LDL of 32, 36, 37, and 39 percent, re-crease). No significant decrease of HDL (p=0.850)
spectively (p=0.000). Baseline levels were de-was observed within the placebo group, with lev-creased in the krill
oil 1-g/day group from 168 els of HDL remaining almost stable, 56.8 mg/dLmg/dL to 114 mg/dL, in the 1.5-g/day
group from to 56.7 mg/dL.
165 mg/dL to 106 mg/dL, and in the 2- and 3-g/ Krill oil taken 1 g/day reduced bloodday groups from 183 mg/dL
and 173 mg/dL to triglycerides by a non-significant 11 percent, from 114 mg/dL and 105 mg/dL, respectively. The
labo120.5 mg/dL to 107.2 mg/dL (p=0.114). A daily ratory results of patients treated daily with 3 g fish dose of 1.5
g krill oil resulted in a non-significantoil did not achieve a significant reduction in LDL
Page 424 Alternative Medicine Review ◆ Volume 9, Number 4 ◆ 2004

11.9-percent reduction of triglycerides, from 122.7 mg/dL to 112 mg/dL (p=0.113). Subjects achieved a significant
reduction of triglycerides at daily doses of 2 g and 3 g daily krill oil – 28 percent (p=0.025) and 27 percent
(p=0.0228) – decreasing from baseline levels of 160.4 mg/dL and
Table 7. Effect of a Lower Maintenance Dose of Krill Oil on Lipids
152.8 mg/dL to 116.1 mg/dL and 112.3 mg/dL, respectively. Fish oil at 3 g/day did not achieve a significant
reduction of triglycerides (3.2%), decreasing from 140.9 mg/dL to 136.4 mg/dL (p=0.239). Interestingly patients in
the placebo group experienced a 9.8-percent decrease in triglycerides (p=0.215).
Blood glucose levels were reduced by 6.3 percent, from 105 mg/dL to 98 mg/dL (p=0.025), in patients
receiving 1 g and 1.5 g krill oil daily, and 5.6 percent, from 92 mg/dL to 88 mg/dL (p=0.011), in those receiving 2 g
and 3 g krill oil daily. A daily dose of 3 g fish oil reduced blood glucose by 3.3 percent, from 90 mg/dL to 87 mg/
dL (p=0.275). Placebo treatment resulted in a nonsignificant blood glucose increase of 0.1 percent, from 92 mg/dL
to 93 mg/dL (p=0.750).
The between-group comparison showed 1 g and 1.5 g krill oil daily was significantly more effective than 3
g fish oil in reducing glucose and LDL, whereas 2 g and 3 g krill oil demonstrated a significantly greater reduction
of glucose, triglycerides, and LDL compared to 3 g fish oil. Both fish oil and krill oil performed significantly better
than placebo for the regulation of glucose, triglycerides, total cholesterol, and HDL.
As mentioned previously, patients receiving 1 g and 1.5 g daily krill oil continued for an0.5 g krill oil daily
(Table 7). These patients maintained a mean total cholesterol level of 192.5 mg/ dL, a reduction of 19 percent
(p=0.000) from baseline. LDL was further reduced from baseline by 44 percent, a reduction from 233 mg/dL to
107.5 mg/dL (p=0.000). A moderate decrease in HDL was seen, from 36 percent increase at 90 days to 33 percent
after 180 days of treatment, which was still a significant increase from baseline (p=0.000). Triglycerides were
slightly decreased further to a reduction of 25 percent from baseline (p=0.000), compared to the 12-percent
reduction observed after 90 days of treatment. Blood glucose decreased by 6.6 percent from baseline (p=0.20),
versus the 6.3-percent decrease at 90 days.
Discussion
Arteriosclerosis is
the generic term for a number of diseases in which arterial walls become thickened and lose elasticity, with
atherosclerosis being considered the most important. With its effects on the brain, heart, kidneys, and other vital
organs and extremities, and despite medical advancements, atherosclerotic heart disease and stroke combined
remain the number one cause of morbidity and mortality in the United States, Canada, and most Western countries.
22
other 12 weeks with a lower maintenance dose of
Alternative Medicine Review ◆ Volume 9, Number 4 ◆ 2004 Page 425

In the United States, cardiovascular dis-
ease has a mortality rate of 39.9 percent for males
and 43.7 percent for females, a 15-21 percent dif-
ference from malignant disease, which ranks sec-
ond.
22
It is estimated that 59.7 million Americans
have one or more forms of cardiovascular dis-
ease.
22
Of the population with self-reported heart
disease, 56-64 percent report restricted activity,
23-37 percent require one or more disability days
per week, and 28-34 percent are unemployed be-
cause of disability or illness.
22
The primary lesion
of atherosclerosis is the fatty streak, which even-
tually evolves into a fibrous plaque. Numerous
randomized trials have proven that lowering serum
cholesterol slows or reverses progression of
coronary artery disease (CAD) and reduces coro-
nary events.
22-29
A daily intake of 1-3 g EPA and DHA or
3-9 g fish oil is currently recommended to reduce
the risk of cardiovascular diseases.
22,23
Neverthe-
less, epidemiological studies evaluating the effects
of fish oil on coronary heart disease are contra-
dictory, ranging from reverse associations to vir-
tually no effect to a beneficial effect.
30-33
One issue
in the efficacy of EPA/DHA may be the
bioavailability of these fatty acids.
A recent study demonstrated in vivo
PUFA bioavailability depends on several factors,
such as the type of lipids in which they are
esterified, their physical state; i.e., lipid solution or
colloidal particle systems, and the presence of
co-ingested lipids.
18
In vivo PUFA absorption was
evaluated by fatty acid analysis of thoracic lymph
of ductcannulated rats after intragastric feeding of
dietary fats.
19
Evidence demonstrates oral essential
fatty acid supplementation in the form of
phospholipids is more effective than triglycerides
in increasing concentrations of long-chain PUFAs
in liver and brain.
18,19
DHA is better absorbed
when delivered by liposomes than by fish oil
(relative lymphatic absorption equal to 91 percent
and 65 percent after liposome and fish oil
administration, respectively). The best
bioavailability of DHA delivered by liposomes is
revealed by an increase in DHA proportions in
both lymphatic triacylglycerols and phospholipids,
compared to a fish oil diet.
18,19
Krill oil is a complex combination of multiple
active ingredients with synergistic bioactivity. The
exact mechanism of action for krill oil’s
lipid-lowering effects is not yet entirely clear.
However, krill oil’s unique biomolecular profile of
omega-3 (EPA/DHA) fatty acids already incor-
porated into phospholipids has exhibited a
lipid-lowering effect on the level of the small
intestine, which distinguishes krill oil from other
known lipid-lowering principals.
18,19
Werner et al
demonstrated essential fatty acids in the form of
phospholipids were superior to essential fatty
acids as triglycerides in significantly decreasing
the saturated fatty acid ratios of liver triglycerides
and phospholipids (each p < 0.05), while
significantly increasing the phospholipid
concentrations of the long-chain PUFAs (p <
0.05).
19
LDL oxidation is believed to increase ath-
erosclerosis through high serum LDL levels in-
ducing LDL particles to migrate into subendothe-
lial space. The process by which LDL particles
are oxidized begins with lipid peroxidation, fol-
lowed by fragmentation to short-chain aldehydes.
At the same time, lecithin is converted to lyso-
lecithin, a selective chemotactic agent for mono-
cytes, which become macrophages that ingest
oxidized LDL. The new macrophage becomes en-
gorged with oxidized LDL cholesteryl esters and
becomes a foam cell. Groups of foam cells form a
fatty streak, the earliest indication of atheroscle-
rosis.
34,35
The unique molecular composition of krill oil,
with its abundance of phospholipids and anti-
oxidants, may explain the significant effect of
krill oil for blood lipid regulation. In comparison
to fish oil, krill oil significantly lowered blood
lipids at lower doses.
The effect of fish oil on cardiovascular disease is
tempered by the presence of methylmercury in
many fish.
33
In fact, the U.S. Food and Drug
Administration has advised pregnant women and
women who may become pregnant not to eat
swordfish, king mackerel, tilefish, shark, or fish
from locally contaminated areas.
36
Therefore, it
may be prudent to obtain these essential fatty ac-
ids via supplementation. Krill oil, and most fish
oil concentrates, are molecularly distilled to re-
move heavy metals.
Page 426 Alternative Medicine Review ◆ Volume
9, Number 4 ◆ 2004
Permission

Conclusion
Atherosclerotic cardiovascular disease is a
major health problem in the Western world, with
CAD being the leading cause of mortality in the
United States. Extensive observational
epidemiologic data strongly associate high CAD
risk to elevated total and LDL cholesterol and low
levels of HDL cholesterol. Extensive clinical trial
evidence has established that favorably altering
dyslipidemias produces clear improvements in
CAD end points.
15-17
The results of this clinical trial demon-
strate that daily doses of 1-3 g krill oil are signifi-
cantly more effective than 3 g EPA/DHA fish oil in
the management of hyperlipidemia. Furthermore, a
maintenance dose of 500 mg krill oil is
significantly effective for long-term regulation of
blood lipids. The unique molecular composition of
krill oil, which is rich in phospholipids, omega3
fatty acids, and diverse antioxidants, surpasses the
profile of fish oils and offers a superior approach
toward the reduction of risk for cardiovascular
disease.
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