The fast pace of modern life makes the microwave oven indispensable, especially at breakfast when speed and convenience are paramount. Heating milk in the microwave has become the most common practice.
Regarding whether heating milk in the microwave destroys its nutritional value, the key factor is the heating duration. Because microwaves heat food very quickly, and the temperature needed to preserve milk's nutrients should not be too high.
If milk is heated in the microwave 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 glass of milk typically takes 3 minutes to heat to 70°C on a gas stove. In the microwave, about 1 minute is sufficient. Friendly reminder: Microwaving can cause uneven heating, so be sure to stir the milk before drinking to avoid being scalded.
Avoid Heating to Preserve Nutrients
Professionals have also stated that heating packaged milk directly in the microwave can have adverse effects on human health. If the packaging material does not explicitly state "microwave-safe," it is not suitable for direct microwave heating.
The milk must first be poured into a container specifically designed for the microwave before heating. Below 100°C, most plastics are generally safe. It is recommended to warm the milk by pouring hot water (below 100°C) over the carton to gently heat the milk.
Friendly 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 true for children, as the intact nutrients in milk are more beneficial for their growth and development.