I had put some thought on this and my hunch was that consuming younger plants and/or animals means fewer "forever chemicals" getting accumulated in the body.

However, that doesn't disprove the hypothesis that DNA can survive the digestive tract. If this [1] is to be believed, it very much does so. The question is, can epigenetic information / ie folds, survive?

[1] https://www.thenakedscientists.com/articles/questions/does-d...