Gotta get you a good old iron stomach. After years of eating street food in China on the daily it's almost impossible now for me to get sick from anything I consume. Therefore I'm much more likely than the next guy to survive an apocalyptic event.
Whatever makes you sick eat more of it until it simply doesn't no more. Lactose intolerant? Eat nothing but dairy until you overcome. Allergic to nuts? Quit being a little b*tch and eat nothing but peanut butter and pistachios until you become a human being and are able to join the rest of us.