Allergies on the down-low

For many years of my life I avoided eating sesame buns with my burgers. One day I decided to try it (knowing that if I had an allergic reaction, it would only be as minor as an itchy throat). I was completely fine. Yet, I am still highly allergic to hummus, which has a major ingredient of sesame. Weird, right? Often, when foods get cooked, the proteins in them that cause allergic reactions are killed. The sesame seeds on bagels and hamburger buns are cooked and aren't harmful to me. 

The same goes with many oils. Often, cheap oils are cooked and therefore don't have the ability to cause an allergic reaction. For example, I'm allergic to coconuts, (common for those with nut allergies), yet I can still eat packaged ice cream that has coconut oil. However, in restaurants the oils are often "cold pressed" and can still cause reactions. I usually avoid these oils at all cost just because I'll never really know if they'll cause an allergic reaction.