Because mung bean contains tannin, it will produce black iron tannin when it meets iron at high temperature, which will make mung bean soup black and have a special smell, which not only affects appetite and taste, but also is harmful to human body.

Second, avoid stainless steel or iron pot cooking traditional Chinese medicine:

Because traditional Chinese medicine contains a variety of alkaloids and biochemical substances, especially under heating conditions, it will have a variety of chemical reactions with stainless steel or iron, or make the medicine ineffective, and even produce certain toxicity when there are many complexes.

Third, avoid using aluminum pot dishes:

Aluminum pot is an outdated kitchen utensil. Because of its poor corrosion resistance, it will react with weak alkali, weak acid, salt and other substances to form special compounds, so dishes, wine, monosodium glutamate and so on should not be packed overnight in aluminum containers. And don't stir the eggs in the aluminum pot, because the egg white will turn gray when it meets aluminum and the yolk will turn green. Leftovers, soup, etc. Should not stay overnight in aluminum containers.

Four, avoid using ebony or smelly wood cooking board:

Ubuntu contains odor and toxic substances. Cooking with it not only pollutes the dishes, but also easily causes vomiting, dizziness and abdominal pain. Therefore, the preferred wood for folk chopping boards is ginkgo, acacia, birch and willow.

5. Avoid using painted or carved bamboo chopsticks:

The paint on chopsticks not only contains lead, benzene and other chemicals harmful to health, but also smells bad after heating, which affects appetite. Carved bamboo chopsticks look beautiful, because they hide evil and shelter evil, are not easy to clean, breed bacteria and are prone to illness.

Six, avoid using all kinds of porcelain seasoning:

Seasoning is best put in glassware. Benzene and other pathogenic colored porcelain contain lead and carcinogens. With the aging and decay of colored porcelain, "radon" in pattern pigments pollutes food and is harmful to human body.

Seven, metal containers avoid acidic drinks:

When the acidic beverage comes into contact with a metal container (iron, aluminum, copper, etc.). ), a chemical reaction will occur, so that the metal substance will be dissolved in the beverage. Once you drink this drink, it will cause chemical food poisoning, headache and nausea. Diarrhea and other symptoms, while lemonade, orange juice, sour plum soup and other drinks have higher acidity. So don't put acidic drinks in metal containers.