<<Disclaimer: Verify this information before applying it to your situation.>> I'm interested in viewpoints on if gluten sensitivity can be caused by something other than celiac. My blood tests showed negative, I did not have a biopsy. I certainly respond to a gf diet. But, is it possible that something else causes my symptoms & responds to a gf diet? e.g., parasite, lyme disease, yeast infection, bacteria overgrowth, candida, etc. Insights into this issue appreciated. *Please provide references to back up claims of a product being GF or not GF*