I know this is the cliche joke, but it's fucking tired - especially considering the fact there is nothing unique about Taco Bell: they pass food safety requirements just like every other shitty fast food restaurant. If you can't eat a few beans without experiencing GI distress, your diet is the problem, not Taco Bell.
Worthers candies pass food safety requirements too but it also states that if you eat too many it can act like a laxative.
So I'll take your word with the oceans weight of salt.
I eat rather healthily considering majority of the meat and veg raised/grown myself and if I eat at any of those fast food shit joints I get the screaming squirts for an afternoon.