Gluten can cause problems for some people

• Wheat allergy is uncommon and occurs when a person's immune system reacts to wheat proteins leading to mild problems. However, in rare cases, it can lead to anaphylaxis.
• Celiac disease is inherited. Eating foods with gluten leads to inflammation and damage to the lining of the small intestine, which impairs intestinal function.
• People with non-celiac gluten sensitivity experience painful gut symptoms and suffer from fatigue, brain fog, joint pain or skin rash.

Diagnoses of gluten sensitivity are based on the development of symptoms, the absence of wheat allergy and celiac disease, and subsequent improvement on a gluten-free diet.

There's no reliable blood or tissue test because gluten sensitivity isn't a single disease but has several possible ca...