If you have diverticulitis or bowel obstruction then you shouldn't be doing liver cleansing, you have bigger fish to fry first.
On the same token you shouldn't eat, right? Something could get stuck.
No easy answers for compounded health problems, but Andreas did not invent liver flushing. Thousands of people did them before he came on the scene, and he checked out way too early for him to be taken too seriously.
Read what I wrote about the logical flaws in his 'rules'. You might also have diverticulitis of the small intestine, and colonics will not address that situation, so then what? The small intestine has a narrow diameter anyway, so why didn't he talk about that? Hmmmmm.
And even if you do a colonic, do you think that you will not absorb anything from your colon in the hours before you start it. Too many flaws with his thinking even though on the surface it seems to make sense.
If you have serious bowel issue then you should go back to square one, Hulda ClarkparasiteBowel Cleanse first until you clear obstructions, or do a different method of liver cleanse where you dissolve everything first.