are we making our own stones by what we do?

Well I know there have been doubts and questions about the composition of stones that we flush out. This isn't another one of those!
However my latest flush, 3 weeks after the last produced both green and cream stones some of which contained kiwi fruit seeds inside.. which I had been eating recently. This would indicate that the stones were a recent formation and made me doubt the whole flush thing again.. ARE WE FLUSHING STONES THAT FORM AS A RESULT OF THE OO/LJ THAT WE DRINK?
Thanks for any elucidation. Tweet