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Bean sprouts turn green after a day.
Soybean sprouts can be eaten when they turn green, which is harmless to human body.

1, ordinary soybean sprouts don't need light when they germinate, so soybeans are always yellow when they become soybean sprouts. Bean sprouts turn green because they encounter light and undergo photosynthesis, which is the normal reaction of plants to light.

2. If you send bean sprouts at home, you can control the bean sprouts from turning green. If you don't want to turn green, put them in a dark place. If you like green, you can put it under the light. Soon, the soybean sprouts will turn green. Therefore, it is normal for soybean sprouts to turn green, so you can safely eat them.

3. If bean sprouts are found to be green and black (called "rotten root" phenomenon), they can no longer be used as food, especially if they are yellow-green and sticky, then don't eat them again. That's aflatoxin, which is very carcinogenic and more toxic.