.. continuation...
Ok, so far, now my paleolithic implications and conclusions.

1) How much, and which relations of fatty acids do we need?
I take a look at the human milk which is a real genetic determined
paleolithic measure - and that even for the time of brain build-up.
HUMAN MILK has:
Fatty acids, saturated           2.009
Fatty acids, monounsaturated     1.658
Fatty acids, polyunsaturated  g  0.497
  18:2  LA        0.374   w-6 fat (?)
  18:3  ALA       0.052   w-3 fat
  20:4  ARACHION  0.026
Obviously the saturated fat part is less than 50%.
and the w-3 to w-6 ratio is about 1:6 (ALA only, no DHA/EPA)
Would about 2 liters for daily vitamin-f need (of adult).

Comparing other sources: Butter Bacon Suet Nuts Lettuce
Butter
Fatty acids, polyunsaturated     3.010
 18:2                            1.830
 18:3                            1.180
Fatty acids, saturated          50.489
Fatty acids, monounsaturated    23.430
Very good w-3 to w-6 ratio.
A little high in saturated fats(50/23/3), much too low on poly's.

BACON, MEATLESS has w-3 to w6 ratio if 8.5 (seems reasonable)
 18:2  LA    13.756
 18:3  ALA   1.686
 has also a good relation of  saturated/mono/poly ration of 4/7/15g.
A reasonable acceptable fat, compared to human milk (I'm astonished)
Need about 66 gram for daily vitamin-f need.

SUET has w-3 to w-6 ratio if 2.4 (seems very good)
Has also a bad relation of  saturated/mono/poly ration of 52/31/3.
Need about 300 gram for daily vitamin-f need.

NUTS, WALNUTS, has a very good w-3 to w-6 ratio 4.5
 18:2                           31.762
 18:3                            6.811
The ratio sat/mono/poly of 5/14/39 makes it an ideal source of
essential fats and add-on to animal fats high in saturated fats.
Need about 26 gram for daily vitamin-f need.

LETTUCE     RAW has a superb    w-3 to w-6 ratio 0.4!
18:2  LA                         0.047
18:3  ALA                        0.113
Would need about 10 kg for daily vitamin-f need.
Would need about 1.2 kg for daily ALA only (10g/7 at 1:6 ratio).

2) How much of the special fatty acids EPA and DHA do we need to build
our brain?
Brains have a content of per 100g of
 20:4  ARACHION                  0.230
 22:5  EPA                       0.130
 22:6  DHA                       0.490
(taken from lamb).
That makes to build  a 1.5kg human brain about
 15*.49 = 7.3g DHA and 15*.13 = 1.9 g EPA total 9.2g.
How much food do we need to get this?
Well, eather 1.5kg brain eaten (raw) or:
Mother milk    9.2/0.052 = 17.6 liters mothers milk
Walnut         9.2/6.8   = 135 grams walnuts
*if* ALA is converted 1:1 to DHA/EPA. If its converted only 1:10
(some references claim this) than it's times 10.
Makes then 1.3 kg of walnuts or 176 liters mothers milk.
Shouldn't be a problem.
Not with mothers milk (nature shows it) and walnuts even better than
brains....  Nuts are really brain food.

A last look at it.
My conclusion: Forget sardines and brains - nuts make it.

I'm astonished how good the dreaded fats from farmed animals compare.
I ask myself, where the coronary risk factor is, that seems to
be associated with animal fats.
Maybe some processing (cooking, hydrating...) worsens the data.
Maybe it's that the higher saturated fat percentage
crosses some critical limit. -- Maybe something else.


Any comments on my attempt get though it?

regards

Amadeus