I have used the grill mat several times when grilling for my husband. I am a very picky eater and did not eat anything the first few times it was used. Friday evening I cooked hamburgers and a few slices of bacon and ate a small piece of the bacon. Less than an hour later I had projectile vomiting and dry heaves that lasted for almost 2 hours. I thought maybe the bacon had not been cooked enough. Last night, two days later, I used the grill mat again to cook vegetables. I ate some of the potatoes and squash and the same thing happened. My husband did not become sick. There was nothing else other than the grill mat that was different. The grill mat is now at the bottom of the garbage can and the good news is my appetite has not returned!