Fast eater, too. I used to simply not have time for it for too long, not knowing when I'll be able to eat next and how much, nowadays it's mostly old habits die hard or it doesn't occur to me the food is available. I tend to forget about it. Unless it's in front of me it isn't there, kind of thinking. Obviously, very unhealthy. Working on it, but it goes soooo slowly.
At times deadpan looks from dear people are what gets me going though. Reminders get me feeling 'faail at basics' and pissed off with myself, look-talk makes me laugh and realize it's not a big deal thing to do, a thing I can change, and not a failure.