It Makes Eric Sick

Eric has a weak stomach, and I have had to cut out dairy to help him out.  Adriana is very good at sharing, and she always wants me to take a bite of her food.  If she is eating something with dairy in it, though, I have to tell her I can't have it.  It didn't take her long to figure out that it's because it makes Eric sick.  It must be pretty confusing for her though.  How would Mommy eating something make Eric sick?  The other day, I asked her if she wanted a jelly bean.  She said she didn't want orange.  I said ok, and she said, "Adriana can't eat the orange ones.  It makes Eric sick."