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Hi Doc! Thank you for taking my question. I've been trying
to find out why Cod Liver Oil is an avoid for type O's. I would
like to take it as it is a good source of vitamin D, but if it
is more detrimental than beneficial, I won't. Could you please
advise? Thank you again. Joe M.
The practice of giving cod liver oil (CLO) began in nineteenth-century
England when young people on a poor diet were deprived of exposure
to the sun. Without sun, their bodies couldn't make vitamin D
(known as the "sunshine vitamin"), and they developed
rickets. Because CLO contains large amounts of vitamin D, it cured
rickets and made a great contribution to public health.
On average, 20 milliliters of CLO contains1,500 IU of vitamin
D, as well as 1.8 grams EPA, 2.2 grams DHA, 15,000 IU vitamin
The omega-3 content of fish oils can lower blood triglyceride
levels, thin the blood, and also decrease inflammation in various
parts of the body.
CLO should be avoided by blood group O non-secretors,
and is generally neutral for healthy O secretors. The reason for
this difference is that Dr. D'Adamo has observed depressed saliva
levels of sIgA (secretory Immunoglobulin A) in O non-secretors
on CLO supplements.
sIgA is similar in a way to blood group antigen secretions
in that sIgA is secreted on all mucosal body surfaces as the first
line of defence against invaders. sIgA inhibits binding of micro-organisms
to mucosal surfaces, preventing entry. sIgA deficiency is associated
with increased gastrointestinal tract permeability and increased
manifestations of delayed patterns of food allergy. It is therefore
essential in ABH salivary non-secretors, who don't have their
blood group antigens on their mucosal surfaces to protect them.
CLO can have a fishy taste and might cause belching, nosebleeds,
halitosis, or heartburn in some people. Gastrointestinal side
effects can be minimized if CLO is taken with meals and if doses
are started low and gradually increased.
Any unsaturated oil, including fish oil, can become rancid
if exposed to heat, light or oxygen. Rancid oils are very unhealthy
because they contain free radical molecules that damage your cells.
Some manufacturers add vitamin E to fish oil capsules to keep
the oil from becoming rancid. Another method is to remove all
the oxygen from the capsule.
Excessive vitamin A and D is possible with too much CLO. Pregnant
women and women who want to become pregnant must be careful about
excessive intake of vitamin A due to its potential effect on the
foetus. Fish oils extracted from non-liver sources are usually
not a problem. Check the label of fish oil products for the vitamin
A and D content.
Fish oil may increase homocysteine concentrations and nitric
oxide metabolism in healthy humans. At excessive levels, these
substances can lead to inflammation and oxidant stress (free radical
damage to the cells).
Fish oil, especially in large doses over a period of time,
has a blood-thinning effect and thus affect bleeding time. Blood
group O tend to have the thinnest blood, and so this may be a
consideration when supplementing with oils. If you have a health
condition, if you are taking blood thinning medication (aspirin,
coumadin, warfarin etc.), or are pregnant always consult with
your physician before taking fish oil or EPA/DHA capsules.
Fish have no refuge from environmental pollution and most have
become contaminated to some extent with mercury, dioxins, and
other petrochemicals. When oil is extracted from fish, these oil-soluble
chemicals are included. In addition, if too much heat is used
during processing, free radical peroxides will be present in the
oil. Therefore it is wise to be very selective when purchasing
any fish oil product. Buy fish oil only from reputable companies
who have verified by independent laboratory analysis that their
product is free from chemical contamination and peroxides.
Vitamin D is known as the "sunshine vitamin" because
the body manufactures the vitamin after being exposed to sunshine.
Ten to 15 minutes of sunshine 3 times weekly is adequate to produce
the body's requirement of vitamin D.
O contains Vitamin D (Cholecalciferol)
150 IU per 3 capsules
For an O non-secretor sardines and mackerel will be beneficial
foods rich in vitamin D
Cunningham-Rundles C. Analysis of the gastrointestinal
secretory immune barrier in IgA deficiency. Ann Allergy. 1986
Tanida T, et. al. Decreased excretion of antimicrobial
proteins and peptides in saliva of patients with oral candidiasis.
J Oral Pathol Med. 2003 Nov;32(10):586-94.
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