Rob Rhinehart, the masochist behind homogenous food paste Soylent, is a quotable character. That’s not much of a surprise; the man replaced a majority of his food intake with a brown liquid, after all.

Rhinehart took on the 4 Liter Challenge issued by clean water nonprofit Digdeep, which just asks people to try to keep their water usage under four liters per day. And Rhinehart, being Rhinehart, took it to the extreme.

He decided to stop pooping, for instance.

Read more here The creator of Soylent stopped pooping to use less water