Interesting, I've never heard of a connection between Mono-Sodium-Glutamat (Natrium Glutamat) and parasites. I bet pretty much anything bad for a human is good for parasites though, unless their host is no longer about to provide them nutrients from what it consumes.
I looked into it and I found this thread. One person says Mono-Sodium-Glutamat (Natrium Glutamat) depletes COQ10. If they were moving around that could mean they either liked the food or it was an irritant to them. My guess is they liked it. I've read that parasites love any "cooked" foods, fast food, high carbs, sugars, etc.