Eli5: why are some foods not advised to be reheated, or heated more than once? Why do some have to be cooked from frozen and other defrosted

Question

Eli5: why are some foods not advised to be reheated, or heated more than once? Why do some have to be cooked from frozen and other defrosted

In: Other

Answer 1

The advisability of reheating or heating certain foods more than once depends on factors such as the type of food, its ingredients, and the specific handling and storage conditions. Here are some general reasons why certain foods may not be advised to be reheated or heated more than once:

1. **Bacterial growth:** Reheating food allows bacteria to multiply, especially if the food was not stored or handled properly. Certain bacteria can produce toxins that are not destroyed by heat, and consuming such toxins can lead to foodborne illnesses.

2. **Nutrient degradation:** Some foods, especially those rich in vitamins and antioxidants, may experience a loss of nutritional value when reheated. The heat can cause the breakdown of certain sensitive nutrients.

3. **Texture and taste changes:** Reheating can alter the texture and taste of certain foods, making them less palatable. For example, overcooking may lead to dryness or changes in the consistency of certain dishes.

4. **Formation of harmful compounds:** Repeated heating of certain oils or fats can lead to the formation of harmful compounds, such as trans fats or oxidized fatty acids, which may have health implications.

As for the difference between cooking from frozen and defrosted, it often relates to safety and evenness of cooking:

– **Cooking from frozen:** Some foods are designed to be cooked from frozen to ensure that they reach a safe internal temperature throughout. Cooking from frozen also helps maintain the quality and texture of certain items.

– **Defrosting before cooking:** For other foods, especially larger items like roasts or whole birds, defrosting is recommended to allow more even cooking. This prevents the outer layers from cooking while the inner parts are still frozen.

It’s important to follow specific food safety guidelines, storage instructions, and reheating recommendations provided by health authorities or on food packaging to minimize the risk of foodborne illnesses and to ensure the best quality of the food.