Well, it's also important to note that the variability is high so the prediction for a single individual won't be of much use
I don't know, but I don't think hydrochloric acid would be able to break down plastics. However, maybe we could find enzymes that would be able to.I found this article that says we already have but they don't work at ambient temperature : https://news.utexas.edu/2022/04/27/plastic-eating-enzyme-could-eliminate-billions-of-tons-of-landfill-waste/Also this one that talks about the subject : https://www.sciencedirect.com/science/article/pii/S0167779921000408
That one on the left is MAD