Hi Cancun.
I find I can eat anything without getting clogged up, if I have a bowl of oates and bran each day. You can also mix Slippery Elm in with the milk you use with this cereal. You then have double the protection for your Psoriasis! More food for thought.
C.Handley.

As fruit goes, bananas are more dense and not fiberous which could be the reason behind the "clogging." Since I eat a variety of fruits, including bananas, I've not noticed any troubles.

If you are a regular eater of other fiberous content such as apples, bran, celery, and so on, it could be with you that there's a chemical reaction which causes your intestines to constrict in their presence.

In general and for most people, bananas are very healthy containing a good amount of potassium and other nutrients.

Fred