Are W3 PUFA in the membrane of RBC associated with lower mortality?

 https://academic.oup.com/ajcn/article/114/4/1447/6301120 

Risk of death improvement associated with different factors

The pavlovian response to such a study largely pushed by the memoir of hunger and lack of food is to eat fatty fish.
Supplementing with a high diet in W3 PUFA, avoiding D2, no smoking and being XX and young doesn't have the same rationale...
But does it have any sense in terms of efficacy and efficiency? 
Look at the quantification of risk and chose a stop and a positive action.
Avoid smoking
avoid D2
eat Myristic acid id est completely fermented cheeses to avoid lactose
and last improve your W3 index.
But the magnitude of the supposed beneficial effect which is associated is not in favour of causality (-1,18).