It is not recommended to eat, the shelf life of dried fungus is generally 18 months, the shelf life of fresh fungus is even shorter, 5 years has significantly exceeded the shelf life, there is a safety risk, it is not recommended to eat. And the provisions of the shelf life is established in the case of suitable storage conditions, that is, placed in a well-ventilated, cool and dry, clean and sanitary environment, such as storage in the warehouse needs to have moisture-proof equipment and anti-mold facilities, if it is stored in a humid or poorly ventilated environment, safe storage time will be shorter.

Deteriorated fungus easy to produce toxins, human consumption can occur after poisoning symptoms, such as abdominal pain, diarrhea and other digestive symptoms, the heavier may appear shock. So even if placed 5 years of fungus appearance normal, not found mold, did not smell the odor, but also do not recommend eating.