Why is it important to have a normal Omega-6:3 fatty acid balance?

Our Western diet contains a lot of Omega-6 fatty acids and relatively small amounts of marine Omega-3 fatty acids, which increases the imbalance between Omega-6 fatty acids and Omega-3 fatty acids in the body.
This imbalance is a hidden factor behind the development of many lifestyle-related health problems.
Both Omega-6 and Omega-3 fatty acids are precursors to hormone-like signaling molecules (eicosanoids) in the body. Eicosanoids derived from Omega-6 are pro-inflammatory. Signaling molecules derived from Omega-3 fatty acids have a lower inflammatory potential, some are also anti-inflammatory.
In many ways, eicosanoids work in concert, and that is why it is important to have a good balance between them.
A normal Omega-6:3 fatty acid balance is fundamental for a good eicosanoid balance, while a high Omega-6:3 fatty acid ratio leads to pro-inflammatory eicosanoid ratios.
The Nordic Council of Ministers recommends that the Omega-6:3 fatty acid balance in the diet should be below 5:1.
The World Health Organization recommends a balance of 4:1 to maintain normal cardiovascular health.