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Would you mind sharing some sources?

source: just google it

Lots of “non-traditional” sources. The Reddit story might have something worthwhile.

It doesn’t sound like it’s a common problem, from my cursory investigation

I meant reliable sources, i.e. scientific papers.

For every bonkers assertion you will find "evidence" by "just googling it". I would be careful not to get trapped in confirmation bias in this way.

There's a wealth of information out there, even scientific papers. Additionally there are thousands of anecdotal reports on vegan forums.

Like I said, just google it. Well documented phenomenon