TMZ TV

Katy Perry's bypassing the time honored rock star demands of drugs and booze during her concerts -- and instead she's loading up on a crap ton of healthy, leafy greens.
So, her heart and liver will be fine ... but her colon will be working some major overtime.
Source:
http://www.tmz.com/2014/01/07/katy-perry-concert-rider-veggies-tmz-tv/