If you add water during boiling, this can cause eggs to crack. The cracked shells make it harder to peel and may introduce bacteria, reducing the egg’s nutritional value.

Undercooking Eggs
Many love soft-boiled eggs, but eating undercooked eggs increases the risk of bacterial infections like Salmonella, resulting in diarrhea, digestive issues, or food poisoning.

Leaving Boiled Eggs Overnight
Boiled eggs should not be left overnight because they can harbor harmful bacteria like E. coli, which can lead to digestive issues or food poisoning. The CDC lists eggs as high-risk for foodborne illnesses.