You ate bread, pasta, and pizza your whole life with zero issues. Then, suddenly, at age 35 (or 50, or 70), a single slice of toast leaves you doubled over in pain.

The common reaction is confusion: "How did I catch this? Did I eat too much bread?"

The truth is, Celiac Disease isn't caught like a cold; it is unlocked. It follows a "Two-Key" system. You were likely holding the first key your entire life, but something recently turned the second one.

Here is the breakdown of why your body suddenly decided gluten was the enemy.

1. The First Key: The Genetic "Loaded Gun"