Removing wrappers and packaging from food before cooking or heating is crucial to prevent harmful chemicals from leaching into the food and to avoid potential fire hazards or explosions.
Many food wrappers and packaging materials, especially plastics, are not designed to withstand high temperatures. When heated, these materials can break down and release chemicals into the food. These chemicals can include endocrine disruptors, carcinogens, and other substances that may pose health risks. Furthermore, some packaging, like metalized wrappers or those containing foil, can cause sparks or even explosions in a microwave oven. Paper or cardboard packaging can also catch fire if exposed to direct heat. Therefore, it's always best to transfer food to microwave-safe or oven-safe containers before cooking or heating. This ensures the food is heated safely and without contamination.
Always check the packaging for specific heating instructions. If the packaging states 'microwave-safe,' it still doesn't mean you should heat the food in it unless explicitly instructed. When in doubt, transfer the food to a glass or ceramic container labeled as microwave-safe or oven-safe.