A limited-ingredient diet, also known as limited-antigen food,[8] is an elimination diet that restricts the problematic foods that cause a reaction. Usually these diets focus on removing specific proteins (protein-elimination diets) due to dietary allergies usually being caused by water-soluble glycoproteins,[9][10] but they can also be targeted towards the removal of gluten/wheat, vegetables, or a combination of both.[9] In commercially available versions of these diets, producers usually include one protein and one carbohydrate source, in an effort to minimize reactions to any foods.[9]