you shouldnt be getting food poisoning from chips and salsa unless you aren't properly sealing the salsa or eating some chips that are just 890678958096 years out of date. You can properly seal salsa with ceram wrap, thats how non-sensitive it is. heh.
You're system may be kicking back certain ingredients though, when it comes to salsa certain acids can cause your body to kinda freak out, but that's usually if you have issues with blood pressure, hypertension or diabetes.
John, my fiance, loves jalapenos, but now when he eats jalapenos (not fresh jalapenos, im talking about preserved ones in vinegar..those things are bad for you like fried porkchops) his system goes into reverse and he gets sick as a dog, his main symptom being a massive headache.
It could be MSG or whatever, its a certain ingredient that usually causes diarhea and symptoms resembling food poisoning. If I eat certain chinese foods, particularly the greasy or extreme salty ones, my body flips out and I gotta get to a bathroom ASAP.
Some foods, like taco bell, kills me. I can't eat taco bell after 4pm, if I do im always very close to asking john to haul me to the ER. Vomit, diarhea, headache, coughing, major indigestion...
yet, as an american, i continue to eat these horrible fucking foods. GO ME!