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The only good vegetable source of DHA is some types of algae. The foods you listed contain alpha-linolenic acid, which the human body can convert to EPA and then to DHA, but this is an inefficient process and might not always meet the full requirements for those longer chain omega-3 fatty acids. See:

https://rnd.edpsciences.org/articles/rnd/pdf/2005/05/r5505.p...

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More bluntly, ALA supplementation doesn't work:

https://www.ncbi.nlm.nih.gov/pubmed/19269799?dopt=Abstract

Walnuts also have a lot of Omega 6 which will lessen the conversion of Omega 3 into useable forms.

Do I understand this correctly that if I consume a lot of Omega 6 (I love olive oil and nuts and consume large quantities of both) I might actually harm myself? Do I make Alzheimer disease more likely by Omega 6 rich diet?

EDIT: I confused Omega 3 <> Omega 6, corrected.

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