Celiac disease is characterized by an intolerance to gluten which compromises the digestion of certain nutrients. Gluten is found in grains such as wheat, rye, barley, and spelt. A diet which is too diverse too early, but also a genetic predisposition are factors causing celiac disease. Children and women are the most affected. Symptoms include fatigue, chronic diarrhea, or unexplained weight loss despite good food intake. A strict gluten-free diet is essential in cases of celiac disease which is causes nutritional deficiencies that must be compensated.