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It contains Phytic Acid. Might be the reason humans started removing it from wheat. It gets broken down in sour dough too.

https://en.wikipedia.org/wiki/Phytic_acid?wprov=sfla1

[edit] remove doubled word

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What’s wrong with phytic acid? I read the link you included. The only negative seems to be it might not be digestible, unless I missed something else?

It inhibits the absorption of iron, zinc, and calcium

It irreversible binds minerals and they get excreted i.e. you can't make use of them.

Does the spermadine also get broken down in sour dough, or is whole wheat sour dough a potential good source?

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