1. Pollution problem: If the purple casserole is not adequately cleaned and disinfected, it may harbor microorganisms such as bacteria or viruses, resulting in food contamination and posing a health threat to the human body.
2. Metal contamination: If the purple casserole is not properly manufactured, maintained and used, metal contamination may occur, such as the dissolution and precipitation of lead, cadmium and other heavy metals, which in turn contaminate the food and pose a risk to human health.
3. Nutritional loss: Purple casserole stew soup for a long time, high temperature, easy to make the soup in the loss of water and nutrients. Therefore, although the taste of purple casserole stew soup is good, but in terms of nutrition and health, compared with other cooking methods may have some deficiencies.
4. Traditional beliefs: Some people believe that the purple casserole can "get rid of drug residues" and "enhance the effectiveness of the drug", which lacks scientific basis, so you need to be careful.