by Gloria » Wed Jun 28, 2006 1:40 am
An earlier few posts here mentioned the use of omega 3 fatty acids in the diet.
In the brain, Neural activity occurs as electrical impulses pass
across synapses from one nerve to another. There are various
chemicals called neurotransmitters, that carry the impulse across the
junction. At the receiving end, where those neurotransmitters attach
to the next nerve, is very critical, and yet most experts are not
acutely aware: a very high proportion of the chemical makeup of that
receiving part (dendritic) is composed of docosahexaenoic acid. When
there is insufficient DHA in the body to make the dendritic reception
site properly, the body will substitute trans fatty acids in making
that part of the brain cells. If you will notice, in DHA, the
molecule by virtue of the 6 cis double bonds, is shaped in a
particular bent up way, but trans fatty acids are bent very
differently. Because of this, those brain receivers do not work
properly, producing such things as depression.
Also, although there is a body system of biosynthesis of the DHA, yet
when there is too much omega 6 fatty acids in the body (as in most
vegetable oils), the biogenesis of DHA is lost because the necessary
enzymes are used up by the omega 6 biogenesis of arachidonic acid,
which when not balanced properly produces brain irritation.
Also, when a child's brain is developing, if there is not enough
available docosahexaenoic acid to develop the brain properly, then
the child's IQ will suffer significantly and permanently.
Best sources dietarily:
1. Mackerel, 2. Pink Salmon, and also other salmon to a lesser
extent, 3. Sardines (from cold water sources, not tropical), 4.
Herring.
Also of course, fish oils such as cod liver oil.
Note these all are cold water ocean fish.
Other ocean fish also have some, but not nearly what these do.
Mackerel is number one.
The content of docosahexaenoic acid in
mother's milk depends heavily on her diet, i.e., how much ocean fish
she eats, especially the abovementioned ones. Smarter kid when she
eats lots of these things during pregnancy/lactation.
The rumour that sardines are good for the brain has been proven to be
very true.
Another point, DHA has six double bonds, every one of which can and
will break upon oxidizing cooking. Translates: Best content of DHA
and also the necessary EPA (with its five double bonds) will be when
items containing them are not exposed to open cooking. Example: do
not cook cod liver oil. Example: canned salmon is best without
further cooking. The original cooking was in the can, without
oxygen, and so with negligible oxidation of the DHA and EPA.
So, to get to the point you want to hear:
When it is found that omega 3 fatty acids can help with brain function and certain mental illnesses, it is primarily referring to docosahexaenoic acid (DHA), and to a lesser extent eicosapentaenoic acid (EPA). The omega 3 fatty acids found in for example flax seed oil, although helpful, yet they need to be transformed biochemically to DHA and EPA to be of primary value, and if the person is connsuming much omega 6 fatty acids (vegetable oils), then the needed enzymes are used up, preventing DHA production. Therefore, to get the real benefit, you need to be taking DHA and EPA more directly. And the physiology of how this happens was briefly stated above.
Food for thought.
"God don't make no junk" --Ethel Waters