I was eating at a Subway restaurant the other day and they asked if I would like my flatbread toasted... I responded with a "No thanks."

They said, "Well technically the flatbread still **HAS** to be toasted, so would you like the meat toasted ?" 

In confusion, I asked, "Why? I would prefer it un-toasted."

They said, "We are required to toast all flatbread, as it releases *some* chemical... or something."

Can anyone clear up what they may be referring to?  Does flatbread (non-homemade) **HAVE** to be toasted / cooked / microwaved ?

Edit: 

> Ingredients: Enriched flour (wheat flour, niacin, reduced iron, thiamine
> mononitrate (vitamin B1), riboflavin (vitamin B2), folic acid, malted
> barley flour), water, soybean oil, yeast, contains 2% or less of
> nonfat dry milk, salt, wheat gluten, sugar, dough conditioner (acacia
> gum, guar gum, ascorbic acid, L- cysteine, enzymes), calcium
> propionate, baking powder (sodium acid pyrophosphate, sodium
> bicarbonate, corn starch, monocalcium phosphate), and sodium stearoyl
> lactylate.