How prevalent is EPA & DHA deficiency in non-fish eaters? When is blood testing appropriate? SEE BELOW?

1) . How prevalent is EPA and/or DHA deficiency in people who neither eat fish nor take fish-oil supplements?

2) . What are the most common ailments, conditions, symptoms that are caused by very low levels of EPA and/or DHA?

3) . Under what circumstances should an individual have a blood test in order to determine blood levels of EPA and DHA?

thanks for your answers

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