Some fungi, such as mushrooms, are eaten, while others are used in the production of foods such as beer, wine, and bread. Fungi produce many of the common antibiotics. Some fungi are used as tools for genetic studies. Fungi have been genetically engineered to produce important hormones such as insulin and somatostatin, the human growth hormone. Since there are fungi that can grow on almost any organic material, fungi destroy large amounts of food products and other materials. Fungi also cause some major diseases of plants, especially food crop plants.