I have been trying to increase omega 3 and reduce omega 6 for a long time. I believe the ratio between these is important for health. Oily fish is good, i happen to really enjoy it.
Interestingly almonds have a really terrible ratio on this
17.4% of the fat in almonds is Omega-6 fat.
Unfortunately, it has no Omega-3 fat.
https://en.m.wikipedia.org/wiki/Almond
Before the invention of seed oils for cooking, everybody had a much lower consumption of omega 6 fats.
If you avoid oils high in omega 6 fats such as canada oil and soybean oil, you can eat anything else you want and you will likely consume less omega 6 fats than 99% of the population.