Okay then I'll try to keep it concise.
Omega 3 and 6 fatty acids are polyunsaturated fatty acids meaning that they have multiple double-bonds that are not saturated with hydrogen atoms (like saturated fat is saturated with hydrogen atoms). This makes them more likely to serve special functions in the body that monounsaturated and saturated fats can't. Relevant to our health this means eicosanoid production. Eicosanoids are signaling molecules that activate the immune response, they're like the spies in the warzone of our bodies. The inflammatory eicosanoids are produced from omega 6 and the anti-inflammatory ones are produced by omega 3. Our bodies can't really regulate the production of eicosanoids so whatever you eat is going to be reflected in the cellular inflammatory interplay. In the past we would eat meat with a good ratio, vegetables, some nuts maybe and some fish/brains so it balanced out nicely. Unfortunately modern agricultural practices have made non-fish consuming diets devoid of omega 3 and high in omega 6 (and you would need to be eating lots of fish to catch up so we like grass-fed animals and fish oil). The idea is that when there is an inflammatory response we should have enough anti-inflammatory molecules to counteract and "turn off" the inflammatory ones and that means having a similar amount of each in our tissues. This means eating a good ratio because whatever we eat is going to be reflected in the tissues.
The "parent" fatty acids linoleic acid (LA) and alpha-linolenic acid (ALA) must be converted to highly unsaturated fatty acids GLA and AA (arachidonic acid) for omega 6s and EPA and DHA for omega 3s. DHA produces anti-inflammatory molecules, EPA tends to produce ones that aren't so inflammatory and block out the inflammatory AA to a degree. GLA is made from omega 6 in small quantities but it is anti-inflammatory. Linoleic acid is found in plants and is the one we get TONS of through nuts, seeds, and most importantly, industrial seed oils and a little will be used to make anti-inflammatory GLA but most is going to end up as arachidonic acid and then produce inflammatory molecules. Arachidonic acid is found in animals and eggs and is a little tougher to go over-board with but conventional farming produces animals with a lot of it (mainly poultry) so most of us have adopted a love affair with beef because it's low in omega 6 no matter what it's fed. Pasture-raised hens, eggs and pork are probably better than conventional. All in all it's not a big deal because it takes a lot more animal to equal the same omega 6 from indsutrial seed oils (save for olive oil maybe). ALA is the "parent" omega 3 but the conversion to the useful ones EPA and DHA is terrible so it's not a good source. We need EPA and DHA from oily fish (tuna isn't all that good for this. I like salmon), fish oil, and grass-fed animals to be truly healthy.
Eating a 1:1 ratio would be great...if we were born yesterday but we have years off too much omega 6 and too little omega 3 so we should ideally be dosing with lots of omega 3 for a time until the ratio in the tissues is corrected. It's probably a good idea to get a tissue test, but if you don't feel like it I say go hard on the omega 3 for a few weeks and reduce the omega 6 and then after you notice health improvements go to a good ratio. Essentially we're not going to want to eat tons of omega 6 and tons of omega 3 because the unsaturated nature of them make them liable to produce reactive oxygen species and to peroxidize in the tissues so the absolute ideal is a little bit of omega 3 and 6 in a good ratio and a lot of saturated fat to protect the tissue.
Best thing a person can do is nutritionfacts the food they eat to see what they're getting, add it all up and try to manipulate the ratios. Fish oil will probably be needed at least in the beginning.
That's pretty much the basics. it would be awesome if Grokologist or another person who really knows their stuff chimed in. I may have asserted a thing or two that isn't 100% accurate.
Stabbing conventional wisdom in its face.
Anyone who wants to talk nutrition should PM me!