A report has claimed that McDonald's fries contain imethylpolysiloxane which for the non-chemistry people (me) is a type of silicone used in Silly Putty! That probably explains why they always stuck to my digestive tract when I ate them. Folks, please note the use of past tense!
 If that is not enough to get your taste buds drooling they also use a petrol-based chemical, namely tertiary butylhydroquinone. It just rolls of the tongue.
Smacznego - Enjoy your meal!