Interesting read from the medical community. Seems riding coasters (at least Big Thunder Mountain in this case) will help pass kidney stones. Another fun reason to ride coasters!
http://www.theatlantic.com/health/archive/2016/09/for-kidney-health-roller-coaster-therapy/501278/
http://www.theatlantic.com/health/archive/2016/09/for-kidney-health-roller-coaster-therapy/501278/