👉 Celiac is a medical condition characterized by an autoimmune response to gluten, a type of protein found in wheat, barley, and rye. This condition can cause symptoms such as abdominal pain, diarrhea, fatigue, weight loss, and malabsorption in the small intestine. The exact causes of celiac disease are not fully understood, but it is believed that the immune system mistakenly identifies gluten as harmful to its own cells or tissues. It is important to note that celiac disease affects about 1