montygram said:Mr. Nature:
Do you think that omega 3 and 6 PUFAs are essential, and if so, will
you state an hypothesis for this notion?
Why are essential fatty acids essential?
There is hardly any question that cannot be answered by doing a search
in Google. The final search string appears to be as follows.
synthesize linoleate OR linolenate "essential fatty acids" site:.edu
In plain English, essential fatty acids are considered essential
because they cannot be manufactured by the body (or are produced in
such small quantities by your body that they must be supplemented by
your diet).
The technical reason is that human beings are mammals and ...
http://72.14.207.104/search?q=cache:6KDT-8rhHSgJ:www.uwyo.edu/MolecBio/LectureNotes/MOLB4610/BIOCHEM_LECT08.ppt+synthesize++linoleate+OR+linolenate+%22essential+fatty+acids%22+site:.edu&hl=en
"Linoleate [18:2; 9,12] & linolenate [18:3; 9,12,15] are essential
fatty acids in mammals" because they are "precursors for arichidonate,
prostaglandins, and thromboxanes."
http://72.14.207.104/search?q=cache:xkGZwTaVMdwJ:courses.mcb.arizona.edu/462b/hallick/lipids/page7.html+synthesize++linoleate+OR+linolenate+%22essential+fatty+acids%22+site:.edu&hl=en
Why?
http://web.indstate.edu/thcme/mwking/lipid-synthesis.html
"Since these enzymes cannot introduce sites of unsaturation beyond C9
they cannot synthesize either linoleate (18:2D9, 12) or linolenate
(18:3D9, 12, 15)."
Again ...
http://72.14.207.104/search?q=cache:J-clHikgOXYJ:www.cm.utexas.edu/CH369/Browning/chapter14/chapter14.htm+synthesize++linoleate+OR+linolenate+%22essential+fatty+acids%22+site:.edu&hl=en
"animals cannot desaturate beyond D 9, must obtain those fatty acids in
diet
- linoleic and linolenic are essential fatty acids
- - linoleic is precursor to archindonic which is precursor of
prostaglandins"
There are no citations to research on this issue because Montygram's
definition of "basic sciences," like biochemistry, tells us so.
Also ...
http://web.indstate.edu/thcme/mwking/lipids.html
"The majority of body fatty acids are acquired in the diet. However,
the lipid biosynthetic capacity of the body (fatty acid synthase and
other fatty acid modifying enzymes) can supply the body with all the
various fatty acid structures needed. Two key exceptions to this are
the highly unsaturated fatty acids know as linoleic acid and linolenic
acid, containing unsaturation sites beyond carbons 9 and 10. These two
fatty acids cannot be synthesized from precursors in the body, and are
thus considered the essential fatty acids; essential in the sense that
they must be provided in the diet. Since plants are capable of
synthesizing linoleic and linolenic acid humans can aquire these fats
by consuming a variety of plants or else by eating the meat of animals
that have consumed these plant fats."
Just thought that you might want to know about "basic science,"
Montygram!