Some mushrooms are healthy, while others are deadly poisonous. Among the healthier mushrooms are shiitake and maitake mushrooms. Poisonous mushrooms include amanitas such as the Destroying Angel.
Maitake mushrooms have been used in traditional Asian medicine to treat high blood pressure and diabetes. There's some evidence that it can help shrink cancerous tumors by its ability to support T-cells and other components of the immune system.
Shiitake mushrooms have also been used in Asian medicine. They've been shown to have substances that protect against cardiovascular disease. They're also a good source of vegetarian iron.
On the other hand, the Destroying Angel is so poisonous that by the time symptoms appear, it may be too late to save the person's life.