Can you eat custard left out overnight?

No, you should not eat custard that has been left out overnight. Custard is a dairy product that contains eggs, which can quickly spoil if left unrefrigerated. Custard that has been left out overnight is at risk of bacterial contamination, which can cause foodborne illness. Symptoms of foodborne illness can include nausea, vomiting, diarrhea, and abdominal pain. In severe cases, foodborne illness can lead to hospitalization or even death.

To avoid foodborne illness, it is important to refrigerate custard promptly after it has been cooked. Custard should be stored in a covered container in the refrigerator and consumed within 2-3 days. If you are not sure whether custard is still good, it is best to err on the side of caution and discard it.