Is it harmful to eat silver ear fungus (Tremella) cold without blanching?

Generally, consuming raw rehydrated silver ear fungus (Tremella) without blanching may pose hygiene risks or affect texture and palatability. However, if thoroughly cleaned and fully rehydrated, it typically poses no significant health risk to individuals in good health. If concerned, it is advisable to consult a healthcare professional in advance. Detailed analysis is as follows:

Silver ear fungus may carry dust, impurities, or small amounts of microorganisms during cultivation, processing, and storage. Blanching with hot water effectively kills most microbes and removes surface contaminants, reducing the risk of gastrointestinal discomfort after consumption. It also partially softens the fungus, preventing a tough, chewy texture when served cold—particularly beneficial for individuals with weak digestion. Relying solely on rinsing with water without blanching may fail to completely eliminate contaminants, increasing the likelihood of physical discomfort.

If the silver ear fungus is sufficiently soaked (typically 2–4 hours, depending on size), repeatedly rinsed under running water, and the base with impurities is removed, healthy individuals with normal digestive function and immune systems may consume small amounts unblanched without obvious issues. However, if improperly stored after soaking (e.g., left at room temperature for extended periods), the fungus can easily develop bacterial growth. In such cases, even blanching may not fully eliminate risks, and consuming it raw without blanching is especially discouraged.

Use clean, cool water to rehydrate silver ear fungus; avoid warm or hot water, as this may promote bacterial growth. If abdominal pain or diarrhea occurs after consumption, stop eating immediately and seek medical attention promptly if symptoms are severe.