Well....

here's the tricky part. Insulin is released whenever we eat, no matter what we eat. The body will release more insulin if it thinks that something high carb is coming down the line than if we eat just protein or only a little bit of carb. This happens already when food hits our mouths and our taste buds and certain enzymes are stimulated. This is why artificial sweeteners can sometimes cause the body to react the same way as if we had just eaten real sugar; it tastes sweet, so the taste buds and brain say, "aha! sugar!" and send the message to the pancreas to get ready for what's coming.
What's tricky about this? Not everyone's body reacts the same way.
Vicky..it's possible that the drop that you saw was in response to an insulin response. It's also possible that the body produced a normal amount of insulin for what it thought was coming its way and then didn't have anything to use it on, so your blood sugar dropped slightly. Did you notice whether or not you felt hungry while this was happening or have any cravings? If you did, then that's a good sign that this is something you don't want to eat very often.