American and British scientists have looked into how mushrooms affect the problem of excessive weight. Experiments involved a large group of volunteers for whom a special mushroom diet was developed. Over month and a half period they had mushroom dishes in their diet four times a week instead of meat. Control weighing showed they all lost 3-4 pounds on average. Scientists link this to the fact that mushrooms are low in calories while they provide a slew of healthy nutrients. They contain almost the entire group of B vitamins as well as vitamins A and D. Mushrooms are rich in proteins, calcium, iron, potassium and other minerals. Some of tree-growing mushrooms even have powerful antioxidants with anti-cancer properties.