I'd wager half of them does not have diagnosed gluten intolerance.
There are many chemicals in bread one can be allergic or intolerant to. Gluten proteins are but one. Bad lactose intolerance and lactose sweetened breads may be responsible for some reported symptoms. Soy protein or bean protein used in fast mixes. Fructans are another.
There are many chemicals in bread one can be allergic or intolerant to. Gluten proteins are but one. Bad lactose intolerance and lactose sweetened breads may be responsible for some reported symptoms. Soy protein or bean protein used in fast mixes. Fructans are another.