I read this article on the BBC website today.
http://www.bbc.co.uk/bbcthree/item/138d9d50-2c3b-4c64-a74f-a148746e4de4
****In January, I ended up in A&E after worsening pains in my abdomen meant I was no longer able to stand up straight.
After a scan and a little while writhing about in a most undignified manner, the doctor told me I had kidney stones, likely brought on by a disproportionately high protein intake, which my body simply couldn’t process and turned into calcified deposits in the kidneys. When these small ‘stones’ get stuck… yeah, that hurts.****