Actually, the more I think about it, the more I see eating as an AS thing for me. First, it is the stimming action. The repetitive motion that I seek when either anxious, stressed, or even happy. On top of that there is the sensory reward I get from it, like how Verdandi described. I enjoy the taste so much, and I also love things that have a crunch to them - the texture and the sound of it. On top of that there is the difficulty to stop doing a particular action, yet it is also kind of pleasing to just "give in" to that. I like a big packet of chips because I can just keep going with the action, and then I find it really really hard to stop doing it. I find it ridiculously difficult at the end of a meal to "put the brakes on", like that whole inertia thing.
As a kid, I was very much a "thumb sucker" for years

and I remember chewing on all sorts of things too.
By what I have described, I must sound like I am quite overweight, but thankfully I am VERY strong willed when I need to be. Yet, it is something I battle with every single day. The need and pleasures of eating vs wanting to be healthy/slim, especially in my current line of work.
it i exactly the same say for me. eating is like the ultimate oral stim