Final answer:
The correct statement indicating an understanding of celiac disease is that the immune system reacts to gluten and damages the gut. Gluten is found in wheat, barley, and rye, and must be completely avoided in the diet of someone with celiac disease to prevent further health complications.
Step-by-step explanation:
The correct understanding of celiac disease according to the patient's statements is option B: "My immune system reacts to gluten and damages my gut." This statement reflects a sound understanding that celiac disease involves an autoimmune reaction to gluten, which leads to damage in the small intestine. Gluten is a protein found in wheat, barley, and rye, which the patient must completely avoid in their diet to prevent damage to the intestinal microvilli and to improve symptoms and reduce the risk of complications associated with celiac disease.
Option A describes an allergy, not an autoimmune response. Option C is incorrect because celiac disease is not related to the fermentative capabilities of gut bacteria but rather an issue with immune response. Option D is incorrect as rye also contains gluten and should be avoided by individuals with celiac disease.