@gratia
Hello:
I believe the fast eating is a dementia symptom, anyway my husband eats very fast.
He is also coughing and gagging a lot after eating, so I fear he has dysphagia. He is scheduled for a swallow study.
I sit with him when I see that he's eating fast, and I told him about a tip I learned at Weight Watchers, to put your spoon or fork down between each bite to slow him down.
Small bites, eat slowly is our mantra these days.
Also, a Speech and Language Therapist mentioned bringing his food to him already cut up in small bites. I don't often remember to do that, but it's a great idea.