At any rate, specifically from reading your material (and others’) I added mono and polys into my diet. I’m the kind of person who could be happy never eating fat- with the exception of peanut butter, which I could eat by the handful- so I actually have to consciously add it. However, from reading it seems that it is advised to have these fats in my diet.

Not sure about satuated fats and egg yolk, though- do we need saturated fats if we are getting the other types in our diet?

The “bad” fat in egg yolk comes from palmitic acid, which the yolk contains 23% of compared to its total fat proportion.
According to a report from the department of Agriculture:
http://books.nap.edu/openbook.php?record_id=22&page=203
egg yolks contain the following fat profile:

* Unsaturated fatty acids:
o Oleic acid 47 %
o Linoleic acid 16 %
o Palmitoleic acid 5 %
o Linolenic acid 2 %
* Saturated fatty acids:
o Palmitic acid 23 %
o Stearic acid 4 %
o Myristic acid 1 %

So, although the WHO Report, Diet, Nutrition, and the Prevention of Chronic Disease: http://www.who.int/hpr/NPH/docs/who_fao_expert_report.pdf
(page 98 of the pdf [88 of the report]; also see page 92) claims *specifically* that palmitic acid is detrimental to CV health, inexplicably the report also claims that eggs have no saturated fat! (see page 93 of the pdf- 83 of the report): “Egg yolk is particularly rich in cholesterol but unlike dairy products and meat does not provide saturated fatty acids.” Is that what that sentence means, or am I reading it wrong?

This is a bit of a puzzler, but I think its safe to assume that egg yolk does indeed contain saturated fat.

At any rate, egg yolk does contain linoleic acid, which may mitigate the bad effects of the palmitic acid, though i am not sure that it contains *enough* LA to ameliorate the palmitic acid. According to the pertinent study http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=Retrieve&db=pubmed&dopt=A bstractPlus&list_uids=12492626 :
“The data indicated that high levels of palmitic acid were not hypercholesterolaemic if intake of linoleic acid was greater than 4.5% of energy.”

But anyway, I added avocado and cod oil. Both of which do still contain saturated fat. So I guess the saturated fat amounts in those, at least, aren’t detrimental.

Sorry for the super-long comment. I’m into this stuff now!
Cheers!