Reasons For Green Poop

https://www.cbsnews.com/news/black-burger-green-poop-why-halloween-whopper-has-odd-effect/
https://www.ncbi.nlm.nih.gov/books/NBK279386/
https://www.cancer.org/treatment/treatments-and-side-effects/treatment-types/stem-cell-transplant/types-of-transplants.html
https://health.ucsd.edu/news/features/Pages/2018-05-11-listicle-what-color-is-your-poop.aspx