Can soy milk that has been left undisturbed for a long time still be consumed?
Generally speaking, whether soy milk that has been left undisturbed for a long time can still be consumed depends on its condition. If the soy milk has not spoiled, it is generally safe to drink. However, if signs of spoilage are present, it should not be consumed. Detailed analysis is as follows:

If the soy milk is unopened and within its expiration date, it is generally safe to consume even after being left undisturbed, provided it has been stored at appropriate temperatures. If the soy milk has already been opened but not completely consumed, it is relatively safe to drink if it has been stored in the refrigerator for no more than three days and shows no obvious signs of spoilage, such as an unusual odor, discoloration, or separation.
However, if opened soy milk has been left for a prolonged period in a warm or humid environment, bacterial growth may occur, leading to spoilage with signs such as unpleasant odors or discoloration. In such cases, it should not be consumed to avoid gastrointestinal discomfort symptoms such as abdominal pain and diarrhea.
It is recommended to store soy milk in a dry, cool, and dark place, avoiding high temperatures and humid conditions. Check the condition of the soy milk before consumption and dispose of it immediately if any signs of spoilage are noticed.