Bnet.com has an interesting article which you might want to read before you order.  First of all, the bread is made with sodium stearoyl lactylate and ammonium sulfate, which are used as a dough conditioners, and azodicarbonamide, a bleaching chemical most commonly employed in the production of foamed plastics.  Not exactly like home cooking.

Their meat is something else as well.  In order to get that meat like flavour, Subway uses autolyzed yeast extract and hyrolyzed corn gluten which are supposed to act like flavour enhancers.  This way when they process the meat, a little bit goes a long way.

What is in your food?

Related posts:

1. Tip of the Day: eat lower on the food chain