Been doing a lot of reading (mostly PubMed), and I’ve come to some conclusions…
First, I’m going to guess oxalate, as it has the most dietary factors.
One thing relatively high in oxalates is cinnamon, now I’ve been using a fair amount of cinnamon to flavor my powder. That being said the oxalates in cinnamon are insoluble, which is what you want (rather than the soluble oxalates in turmeric). Insoluble oxalates will tend to stay in the gut, whereas soluble ones get absorbed, but can then come out of solution in unfortunate places (like the kidneys).
That being said it’s a lot of cinnamon, so it is possible that the Soylent isn’t totally blameless.
There is also talk of avoiding animal protein, which means ‘horray for Soylent’, but that’s for another type of stone.
I also had one liver enzyme a bit high, and I know there is some talk about lots of cinnamon causing some liver issues. This means I’m not going to be adding cinnamon to my Soylent anymore which is sad because I like cinnamon in my Soylent.
The family members mean well and they are worried about me, so I’m going to go off Soylent for a month (although not sure what that will show… if I get a stone, doesn’t mean it wasn’t Soylent and if I don’t doesnt mean it was…but if it makes them happy, I’ll go ahead.)