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And you know that how?

Well I happen to be a clinical chemist, but beyond that, anyone with celiac disease can tell you this from personal experience.

I once carefully picked a piece of cheese from a sandwich that had been made an hour or so earlier. I spent the night in an emergency room on an IV.

I realize you don't know much about this disease. Celiacs are told to use only certain toothpastes because many of them contain gluten. We are asked to have our own pots and pans and to avoid teflon which has had gluten on it in the past. I have my own toaster because crumbs from the one my family uses can make me sick. We have to pick and choose our spices as well.

The average gluten-containing diet contains roughly 10-40 grams of gluten per day. This figure is based on the amounts of gluten in your average slice of whole wheat bread, which contains around 4.8 grams of gluten (10% gluten by weight), and the amount of gluten in a serving of pasta, which is roughly 6.4 grams of gluten (11% gluten by weight). The smallest amount of gluten which has been shown by a biopsy to cause damage to a celiac is 0.1 gram per day (Catassi et al.). This is approximately the amount of gluten contained in 1/48th of a slice of bread! The biopsies in this study showed an increase in intraepithelial lymphocyte count, one of the earliest signs of damage. The challenge was on 10 patients (children) for 28 days each. Four of the patients showed an increase in IgA antigliadin antibodies. The intestinal permeability test remained normal.

"Well I happen to be a clinical chemist, but beyond that, anyone with celiac disease can tell you this from personal experience."

So, everyone but McDonald's knows this to be a fact. And if their research shows that the gluten in the cooking oil does not transfer to the fries, then they're lying. Correct?