The diet most often recommended for people who suffer from diabetes mellitus is one that is high in dietary fiber, especially soluble fiber, but low in fat (especially saturated fat). Patients may be encouraged to reduce their intake of carbohydrates that have a high glycemic index. However, in cases of hypoglycemia, they are advised to have food or drink that can raise blood glucose quickly, followed by a long-acting carbohydrate (such as rye bread) to prevent risk of further hypoglycemia.