Hot dogs, specifically cheap ones. Not only do they make me sick it is not just a sour stomach feeling, it is immediate puking. My wife thought it was a joke but because it is so predictable in me I ate a cheap hot dog and within 10 minutes it was back. She believes me now. I buy all natural wieners made by my local butcher shop. I swear I could eat those things by the dozen before, not anymore. And yes, I have eaten 16 hot dogs and buns in one sitting.