Yep a craving for bananas can mean you may be low in potassium. Its something you should get checked, as being on pred can lower your potassium, and if its low it can cause some bad symtoms, so ask your dr to check it out for you.

Mine was way low, and my GP ran through all the symptoms which included heart problems, but when he got to weak muscles we both just laughed, how do you tell the difference between mg weak and potassium weak, at least we got a laugh out of itl