There is something called Sensory Gating. Schizophrenics use tobacco for this and it works very well. I often wonder if food is sensory gating for me. The senses stop, revert, go down when I eat, but I have to eat alone for it to happen. No one can talk to me when I eat and people know that. BUt I think , actually, you might be onto something. It's not emotional. It's about sensory overload.
Sensory gating - Wikipedia
Interesting! I don't know if this is related....but I am very surprised to realize how much I hate it when someone touches me while I am eating. I completely tense up, I can't stand it, and I have to force myself to keep chewing. My natural impulse is close to slapping the person off of me, I almost feel like some kind of wild animal guarding it's food. But I only feel that way when they touch me (a hug, a touch during conversation, etc.), otherwise I wouldn't know.
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