I have tried two brands and types of hearing aid and they both fell out when I chewed.
HearPod micro 32 channels fit comfortably and greatly improved my moderate high frequency hearing loss in all environments. They became loose and would eject out of the canal and into my outer ear whenever I chewed. This was distracting enough that I returned them to HearPod. HearPod support suggested a switch to open fit or custom molded fit as solutions.
Not wishing to bother with ear impressions, I consulted a local hearing aid professional (Kelsey-Seybold Clinic) who gave me a pair of Oticon 6000 open fit aids to try. They worked well in all environments, but unfortunately the result was the same. When eating, the aids would pop out of the ear canal and hang loosely in the outer ear.
At this point I am seeking confirmation from the forum that it is possible to wear hearing aids and eat a meal without the aids being ejected from the ear canal. I would be interested on any solution