Shiitake mushrooms should not be eaten raw because they contain a compound called lentinan that can cause a painful and itchy skin rash known as shiitake flagellate dermatitis in some people. This reaction occurs when the mushrooms are raw or undercooked. Cooking shiitake mushrooms thoroughly at an internal temperature of around 266-293°F (130-145°C) neutralizes lentinan and makes them safe to eat. The rash caused by eating raw shiitake mushrooms is temporary but can be quite uncomfortable. Therefore, it is advised to always cook shiitake mushrooms before consuming them to avoid this risk.
While some sources mention that shiitake mushrooms can be eaten raw and have a unique umami flavor, the health risk associated with lentinan usually outweighs this benefit. In rare cases, skin reactions can occur after eating raw shiitake mushrooms.
Summary:
- Do not eat shiitake mushrooms raw due to risk of a rash caused by lentinan.
- Cook shiitakes for at least 5-7 minutes until tender and lightly browned. Temperature should reach about 266-293°F.
- Rash (shiitake flagellate dermatitis) is itchy and whip-like in appearance, usually resolving in weeks.
- Cooking neutralizes the harmful compound making shiitakes safe and more palatable.
This advice is important for safe consumption of shiitake mushrooms.
