If the onion is simply sprouted and not moldy, it is fine to eat. Onions usually grow sprouts in more humid environments, and in this case, they do not produce harmful substances such as lobelia like sprouted potatoes do, so eating sprouted onions does not cause physical damage. Only after the onion grows buds, the nutrient content, proportion and flavor have changed. However, since onions are very susceptible to mold and mildew when sprouted in a humid environment, it is necessary to observe them carefully to rule out mold and mildew. If you eat onions that have sprouted and are moldy, it is easy to cause your body to be poisoned, especially because many molds, such as Aspergillus flavus, can secrete aflatoxin, which is a very pathogenic substance. It is recommended to eat the food as soon as possible after purchase to avoid mold.