Can I still eat Chinese yam (Dioscorea opposita) after it has sprouted?

Generally, whether sprouted iron-stick yam (Chinese yam) is edible depends on its external and internal conditions. Detailed analysis is as follows:

If the sprouted iron-stick yam shows no signs of mold, blackening, or skin damage, and when cut open, its texture remains firm without rotting or unpleasant odor, it can generally be consumed after removing the sprouted portion and a small amount of surrounding flesh. Although some nutrients may have transferred to the sprout and its texture and taste might be slightly compromised, no harmful substances are produced. After thorough washing and adequate heating, it can be safely cooked and eaten as usual.

If mold spots or black patches appear on the skin after sprouting, or if the inside turns brown, becomes soft and rotten, or emits an unusual odor, it should not be eaten. Mold may easily develop during sprouting, possibly producing substances harmful to health. Even after removing the sprouted and moldy sections, harmful substances may have already spread. Consumption may cause gastrointestinal discomfort.

Iron-stick yams should be stored in a cool, dry, and well-ventilated place, avoiding moisture and direct sunlight to reduce the chances of sprouting and mold development. A careful inspection of both the exterior and interior should be conducted before consumption, and they should not be eaten if there is any uncertainty about their safety. Ensure they are thoroughly cooked before eating, and avoid consuming them raw. If discomfort occurs after eating, consumption should be stopped immediately and symptoms monitored.