How much time an egg should be boiled without harming the proteins and other nutrients?

Boiling an egg for 3-5 minutes is generally considered the optimal time to preserve its nutritional value while cooking it through. Here's why:

* Protein Denaturation: While boiling does denature some proteins, it's not a major concern for most nutrients. The proteins in eggs are very stable and remain largely intact even after being cooked.

* Nutrient Retention: Most vitamins and minerals in eggs are heat-stable. While some slight loss may occur during cooking, the overall nutritional value remains high.

* Texture and Flavor: Boiled eggs cooked for 3-5 minutes will have a firm white and a slightly runny yolk, providing a balanced texture and flavor.

However, cooking times can vary depending on the size of the egg and your desired level of doneness:

* Soft Boiled: 3-4 minutes

* Medium Boiled: 5-6 minutes

* Hard Boiled: 8-10 minutes

Note: Overcooking eggs can lead to a rubbery texture and a greenish ring around the yolk, which is a harmless but unsightly result of iron sulfide formation.

For the best results, use fresh eggs and start them in cold water. Add a teaspoon of salt to the water to prevent cracking.