Overnight beans such as spoiled can not be eaten, overnight beans did not spoiled can eat, but from the health point of view is not recommended to eat.
Overnight four season beans placed a night, may have produced bacteria, microorganisms, easy to cause deterioration, eat may bring digestive burden to the stomach. If the overnight beans are not spoiled, the flavor is normal, you can heat and continue to eat.
However, from a nutritional point of view, overnight four season beans after a night and re-heating, four season beans in the nutrients are destroyed, nutrients are greatly reduced, than fresh just made four season beans nutritional value is low.
Therefore, from a health point of view, it is recommended to eat less overnight four seasonal beans, daily try to do meals not overnight.