DHA levels in blood being lower doesn’t mean much if they get enough DHA. Higher blood levels may mean those people consume more than is needed. AFAIK there is

DHA levels in blood being lower doesn’t mean much if they get enough DHA. Higher blood levels may mean those people consume more than is needed. AFAIK there is no clinical DHA deficiency established by the literature. Consider that diets that include fish don’t get anywhere near 1.5g a day of DHA, and that many humans didn’t eat fish at all. Fish oil supplements are a relatively recent phenomenon that came about without any evidence of deficiency. I don’t consume any dietary DHA or EPA and don’t supplement. I’m fine, as is every person like me (vegan or not).