Adding Water While Boiling
Adding water during boiling 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 prefer soft-boiled eggs, but eating undercooked eggs increases the risk of bacterial infections like Salmonella, leading to diarrhea, digestive issues, or food poisoning.

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