Whether hard-boiled eggs can be eaten overnight needs to be decided according to whether the eggs are spoiled or not. If the overnight eggs are not spoiled, they can be eaten; if the eggs are not well preserved, have an odor, and spoilage has occurred, they are not edible. If you are not sure if you can eat a hard-boiled egg overnight, you can open the shell and check it. If the egg itself has no spots, smells no odor, and did not find any different from fresh cooked eggs, indicating that the preservation of better not spoiled, generally can be eaten, will not affect the body. However, it is also recommended to use after heating, heating can kill bacteria produced overnight, but also to avoid cold eggs to stimulate the stomach and intestines. If you peel open the egg shell, there is an odor, or found that the eggs have grown spots or hair, that is not properly preserved, the eggs have deteriorated, it is not allowed to eat, to avoid causing gastrointestinal discomfort, affecting the health of the body. Daily recommended to eat fresh food, according to the amount of food to prepare, try not to let the food overnight, because after the overnight food nutrients will be destroyed, and may even breed bacteria, eat after the health is not good.