The only fast food burger that ever sickened me was from White Castle. One bite, and I immediately had a splitting headache. Thought it was just a fluke, so quite a while later I tried another one, with the exact same effect. The thing is, when we're traveling, Mr. M always wants to take a break and stop at McD's, where he can get two of the little burgers, plain, with a small fries. I always stand there looking at the menu in desperation. Nothing. Bupkes. I usually end up just getting a soft drink.