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I don't mean this to be combative, but what makes you assume it is genetics? The amount of conflicting and often known false "health" information out there makes it very likely that you just haven't tried the right change yet. Try cutting out polyunsaturated fats and using coconut oil for cooking. PUFA are broken down into toxic free radicals by lipid peroxidation. Long term exposure to these free radicals causes hormonal problems including thyroid dysfunction, insulin resistance and leptin insensitivity. Eliminating PUFA and upping your anti-oxidant intake is much easier than most other diet options as long as you cook for yourself. Unfortunately it is essentially impossible if you want to buy pre-made food as almost all of it contains "vegetable oil".

Because those two words were a quote.

>Fish oil is not needed at all. The EPA and DHA in fish was initially produced by algae anyway

People who lived in areas without fish also lived in areas without algae.

>The 2 essential fatty acids are

It is worth noting that there is basically no evidence that those 2 fatty acids are actually essential. A single study done in the 1930s is the basis for that belief. A study in which rats fed no fat got symptoms we now would consider indicative of vitamin B6 deficiency. This study was done prior to the discovery of vitamin B6. Although adding "essential" omega 6 fatty acids alleviated the rat's symptoms, later studies were able to alleviate the symptoms using vitamin B6 while the rats continued to receive absolutely no fats.

>Linseed oil (flaxseed oil) is a good provider of essential fatty acids

And linseed oil consumption is correlated with an increase in all cause mortality.

>Experts recommend a vegan diet against heart disease and cancer.

Experts recommend all sorts of things that contradict evidence. Like taking statins even though they increase mortality. Or switching from perfectly safe saturated fats to "heart healthy" trans fats even though it increases mortality. Or once trans fats were too obviously bad they simply changed their recommendation to "polyunsaturated fats" which are also correlated with increased mortality.

But since statins increase deaths from cardiovascular disease, it is very possible that EPA is only protective against the damage of statins, rather than being beneficial in general.

How is low dose aspirin bad for the average person? It is an anti-inflammatory, and inflammation is a leading theory of potential disease causation for a number of diseases. Daily low dose aspirin is associated with a significantly lower all-cause mortality in average people.