Sure, all the real experts are at Glorious Communist Nanking University.
DNA and RNA get broken down into mononucleotides by the nucleases (DNase and RNase).
There are a large number of conditions/diseases that leave leakage points in the upper and lower GI.
That's how the microRNA gets into your blood stream.
We can only assume they are carrying out the instructions of their Galactic Overlords who are plotting to take over the Earth and turn us all into heads of cabbage.