1, too long heating time, protein degradation of meat raw materials, a large number of gel components oozing out, meat toughness increased, which is not conducive to human digestion and absorption;

2, the seal is tight, and the fishy smell and peculiar smell of meat are difficult to be distributed. At the same time, some bad substances such as low fatty acids will be stored in food and soup, and long-term heating will easily produce substances harmful to the human body;

3, commonly used ordinary casserole may contain timely substances, and some casseroles are fired with glaze, and there are some harmful substances in the glaze. Long-term food entering the human body will affect people's health.