I was recently arguing with a vegan about how healthy it really is to be vegan, and I sent a german paper that tested 75 people and found a generic lack of iron absorption.

The other person said 75 is too small size, and sent me a literature review that claimed that iron absorption in vegans is fine. The only source for that claim in the literature review was the same paper I had originally sent.

So the authors of the literature review just quoted a paper, completely changed the original conclusions, and got it approved.

If we were serious about science, they should all face punishment for even attempting this. But they knew that at worst their paper would be rejected.