"Fish fed exclusively or largely a diet of feeder fish are extremely likely to develop HITH. They are also in high risk of contracting other diseases, such as ich, numerous other parasites, or fungal infections. It is important to resist the urge to watch your fish chase their food, it is for their own good."
http://www.cichliddepot.com/library/care/hith.php
"Fish fed exclusively or largely a diet of feeder fish are extremely likely to develop HITH. "
taken directly from that same article.
Feeding live food OCCASIONALLY does not CAUSE HITH. However, feeding live foods PRIMARILY (key word here) is CONDUCIVE to contracting HITH, as is ANY OTHER diet deficient in vitamins and essential nutrients.