The fast pace of modern life makes the microwave oven indispensable, especially for breakfast when speed and convenience are paramount, making it the most common practice to heat milk in a microwave oven.
Regarding whether heating milk in a microwave oven destroys its nutritional value, the key factor is the heating duration. Because a microwave oven heats food very quickly, the temperature must not be too high to preserve the nutrients in milk.
If milk is heated in a microwave oven for too long, the high temperature will cause the proteins in the milk to change from a sol state to a gel state, leading to sediment and affecting the quality of the dairy product. The longer the milk is heated and the higher the temperature, the more severe the nutritional loss, with Vitamin C being the most affected, followed by lactose.
A 250ml cup of milk typically takes about 3 minutes to heat to 70°C on a gas stove. In a microwave oven, however, about 1 minute is sufficient.
Kind Reminder: Heating in a microwave oven can result in uneven temperature distribution, so be sure to stir the milk before drinking to avoid being scalded. Avoid heating to preserve nutrients.
Professionals have also stated that heating bagged milk directly in a microwave oven can have adverse effects on human health. If the packaging material does not specify "microwave-safe," it is not suitable to be heated directly in a microwave oven.
The milk must first be poured into a container specifically designed for microwave use before heating. Below 100°C, most plastics do not pose a problem. It is recommended to use boiling water below 100°C to warm the milk bag, thus gently heating the milk.
Kind Reminder: Experts point out that if you can avoid heating the milk, you should do so to preserve its complete nutritional value. This is especially important for children, as the intact nutrients in milk are more beneficial for their growth and development.