I think this information is interesting and shows why I think our current diet is the 'experiment on children' not giving supplements.
9. WHY HAS THIS OMEGA 3 - OMEGA 6 IMBALANCE OCCURRED?
We can trace our human ancestry back 4 million years. For more than 99% of that time humans were hunters and foragers. This established our dietary balance between omega 3 and omega 6 at the ideal proportion of 1:1. Many doctors believe that humans kept this balance until the mid 1800's when our diet began to fundamentally change. Our present day diet, rich in grains and seeds but poor in marine life, increases the omega 6 presence in our bodies.
"Omega 3 consumption has decreased to one sixth of the level found in our food supply in the 1850?s. Omega 6 consumption has doubled in that time drastically changing the ratio of omega 3 to omega 6 in our food supply. This change is reflected in the makeup of our tissue fats and in our health." (Dr. Udo Erasmus, FATS that Heal, FATS that Kill, 1995 (3rd edition), Alive Books. p52)
In a recent study, scientists concluded that " ... we are now eating 1/10th of the amount of omega 3 required for normal functioning. Alarmingly, 20% of the population has levels so low that they defy detection." (Dolocek, Grandits, World Rev. Nutr Diet. 1991, 66: 205-216)
Dr. A. Simopoulos writes that since 1960 our intake of omega 6 had nearly doubled and mirrors the increase of some of diet based diseases. She concludes that,"... it seems increasingly likely that the glut of omega 6 fatty acids in our diet is contributing to our high rates of cancer, depression ... diabetes."
10. WHAT IS BEST METHOD OF OVERCOMING THIS OMEGA 3 IMBALANCE?
If you are not prepared to make radical and permanent changes in your diet to include food high in omega 3, the most immediate answer would be omega 3 supplements.
Today, the ratio of omega 6/omega 3 is between 10-20:1 in Western Europe and in North America, whereas during evolution it was 1:1. Our current diet (Western diet) is characterized by an increase in total, saturated fat, trans fatty acids, and the omega 6 EFA; a decrease in the omega 3 EFA, the antioxidant vitamins C and E, and calcium and potassium; and an increase in sodium intake.
The change in the EFA balance came about because of the indiscriminate recommendation to substitute vegetable oils. i.e., corn oil, safflower, sunflower, and cottonseed oils, for saturated fat since 1960. These vegetable oils are very high in omega 6 fatty acids and very low in omega 3 fatty acids. Corn oil has a ratio of Omega 6/Omega 3 of 60:1, and safflower oil 77:1. In addition, because farm animals are grain-fed, their carcasses contain only small amounts of omega 3 fatty acids, but they are high in saturated fats and omega 6 fatty acids unlike the composition of meat from animals in the wild. Eggs and poultry in agriculture, fish in aquaculture, and cultivated plants contain lower amounts of omega 3 fatty acids than eggs from free-ranging chickens, fish in the wild, and wild plants (i.e., purslane). (Dr. A. Simopoulos - The return of omega 3 fatty acids into the food supply - 1999)