There are many varieties of mushrooms, each with its own shape and its own distinctive flavor. Some mushrooms are edible and are widely used in the kitchen, while others can be toxic and must be avoided. Mushrooms are a source of protein, fiber and many essential nutrients, such as potassium, copper and selenium. They are also low in calories and fat, making it a healthy option for those who monitor their weight. However, it is important to note that some fungi may be difficult to digest for some people and should be consumed in moderation.