Ramadan or Lent, fast for specific religious reasons is perhaps most meaningful of all.

Or the required 10 hr. fast requested by your doctor, before undergoing blood testing.

Otherwise no juice diets. There's no rhyme or reason but occasionally I have just soup broth with veggies for supper..of course already had something more solid for brekkie/lunch.

The body needs some healthy, diverse fibre also, just scale down the fibre not eliminate it.

Geez. I'm sorry ...I need my solid fresh fruit and veggies not just fruit juice and soup, etc.

I'll wait until I'm 95 yrs. old when my food is softened or made liquid when I might have problems swallowing food or drinking fluids properly due to declining fragility.

No family doctor or registered dietician would be support juice diets for "cleansing".