Oh yeah, Celiac IS serious. Your risk of additional autoimmune diseases is much, much higher. Your risk of colon cancer, lymphoma and probably a few other cancers is also higher. It can cause brain lesions and MS like symptoms, ataxia (difficulty walking), thyroid problems... wow, the list is very, very long.

But it is one where if you catch it early enough you can have very good results.

BTW: Two myths about Celiac that persist (of many), you can pass gluten through breast milk and there are now studies showing that even inhaled gluten can cause problems.