Diet therapy is a broad term for the practical application of nutrition as a preventative or corrective treatment of disease. This usually involves the modification of an existing dietary lifestyle to promote optimum health. However, in some cases, an alternative dietary lifestyle plan may be developed for the purpose of eliminating certain foods in order to reclaim health. For example, the latter kind of therapy is often recommended for those who suffer from allergies, including those that are not food-related. Elimination diet therapy is often found to be helpful in improving symptoms associated with attention deficit disorder and hyperactivity in children.