I always wondered about allergies and how some people are deathly allergic to certain but others aren't...

I have environmental allergies (ragweed, dust, etc.) and very mild allergies to walnuts and watermelon.

If I eat a desert that was walnuts in it, I'm fine. But if I eat a handful of whole walnuts, I can feel my tongue getting itchy and swollen. Same with watermelon...In the summer if I eat a LOT of it in one sitting, which I always do, my tongue and face start to itch.