MEANING : (n.) an intelligent person with a non-social obsession (such as computer programming) that renders him/her annoying or unattractive.
Celiac disease is believed to be an autoimmune disorder. While genetics appear to play a role in causing it, some people at risk for celiac disease will not develop it until something triggers their immune system, such as a viral infection or severe emotional stress. An Introduction to Celiac Disease and Its Causes.
Testing for celiac disease almost always starts with blood tests. These tests look for your body's reaction to gluten, the protein found in wheat, barley and rye that causes celiac disease. The blood tests aren't perfect. If your celiac blood tests are negative, it means you're much less likely to have celiac disease ... but there's still a small chance that you have it.