Gluten is as Kryptonite.

Public Domain

Public Domain

If I were a super human and I had one weakness or Kryptonite as it were, I would have to say it is Gluten, nothing stops me faster than getting into gluten.

Feed me gluten and I will spend a lot of time in the rest room and unable to perform my super tasks.  Even at places where they have gluten free menus and kitchens they will still mess up.