Question: What is the risk of a food-related allergic reaction if I kiss someone who ate the food?
Answer: If you kiss somebody who's allergic to the food that you've just eaten, there is the possibility that it can cause a reaction. Generally speaking, that reaction could be small, but of course it depends on how sensitive the person is and how much of the food you transferred to them, how much they ingest. It's been reported that severe reactions can occur in this manner, but generally speaking, you would think that the likelihood is low, and the nature of the reactions would generally be small.
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