"21. Bear in mind that the ratio of Omega 6 to Omega 3 is crucial. Omega 6 is contained in many vegetable seed oils and seeds, the best sources being safflower (75%), sunflower (65%), corn (59%), and sesame (45%). These oils contain only small amounts of Omega 3, however, less than 1%. Thus, high consumption of such oils will produce an extremely unsafe excess of omega 6 to omega 3, with various detrimental consequences as outlined above."
and this is what was outlined above:
"20. It appears that individual needs for EFAs in the diet may vary considerably. Ancestry no doubt plays a huge role in this individuality. Saturated fats are far more stable than monounsaturated fats, which in turn are more stable than polyunsaturated fats such as the EFAs. The melting point of saturated fats is higher than that of mononsaturated fats, which in turn is higher than that of polyunsaturated fats. Compare, for example, butter, olive oil, and flax oil. Rancidity is a greater concern as temperature increases. Flexibility becomes a greater concern as temperature decreases. If we observe both plants and animals at various latitudes and climates, it is clear that there is a tradeoff between chemical stability and flexibility, with different results in different climates or latitudes. In warmer climates and lower latitudes, saturated fats tend to predominate as rancidity becomes the greater issue. In colder climates and higher latitudes, a lack of flexibility becomes the greater issue, and thus polyunsaturated fats tend to predominate. In the middle latitudes, monounsaturated fats may make the most sense. The food chain in colder climates thus tends to have a much greater EFA content than that in warmer climates. Therefore, for example, a person of Scandinavian ancestry may require far more EFAs in the diet than a person of Indian ancestry, for the simple reason that their ancestral diets were vastly different as far as EFA content."
then the one below that ties it all together:
"22. There are few rich vegetable sources of Omega 3. Pumpkin seed oil (0-15%), soy bean oil (7-9%), walnut oil (3-11%), and hemp oil (20%) all contain Omega 3. By far the richest source of Omega 3 is flax oil, which is 55-65% Omega 3 as well as 15-25% Omega 6. Flax oil therefore can be used to correct an excess of omega 6 compared to omega 3 in the diet. But it should be noted that the ratio of omega 6 to omega 3 in flax oil is too low to be considered ideal. Therefore, if a person were to consume large amounts of flax oil without some dietary source of omega 6 to counteract this, they would eventually develop an excess of omega 3 in their tissues and consequent health problems. One such problem will be lowered immune function. For this reason, it is best to either balance flax oil consumption with a rich source of omega 6, or better yet to use an oil blend with a more ideal ratio of the two EFAs. And of course to make sure this oil has not been exposed to light, oxygen, or heat during processing, storage, or transport."