This thread reminds me of a story I heard a long time ago...
A pastor was telling us about one of his colleagues who was serving in a prayer line for healing.
A heavyset woman in his line told him, "Pastor! I need for you to pray that this Demon of FAT will come out of me!!!"
The pastor looked at her for a minute, then thoughtfully replied, "Sister, this kind can only come out with prayer... and FASTING."