>>>Question: I'm wondering if it's possible that cleansing the liver (and bowels or cleansing in general) can eventually eliminate cravings<<<<
why would? craving it's a human thing, nothing wrong with it
when under control. I banana has quite a lot (~27g) of carbs including 3g of fiber so no wonder it can create some craving for more carbs. The only way to eliminate this is not eating carbs almost at all like e.g. cats. I did once for a 2 months and didn't have any tempting after a while.