i've done the blessed herbs Colon Cleanse twice with great success. i did not get hungry because the psyllium drink makes you feel full. it's a little hard if you smell food or have to prepare food for your family, the food is tempting for sure, but I was able to do the liquid fast with no problem. as for green drinks i really don't know...i suppose that should be fine though. you should contact them directly and ask. by the way i did find the psyllium drinks backed me up quite a bit even with the digestive stimulator caps so i did nightly enemas on the cleanse and this is when I got a lot of mucoid plaque out...just a tip in case you get backed up don't be afraid to do an enema or two but hopefully you won't have to.