Aluminum kitchenware: non-toxic, but excessive accumulation of aluminum in human body will accelerate human aging and have a certain adverse effect on memory.
Iron kitchenware: non-toxic, but it is forbidden to use rusty iron kitchenware, because it will cause digestive tract diseases such as vomiting, diarrhea and loss of appetite.
Ceramic kitchenware: Although it is the least toxic in kitchenware, the glaze in many ceramics contains lead, which is toxic.
Copper kitchenware: non-toxic, but high copper content will cause hypotension, vomiting blood, jaundice, mental disorder, and even partial necrosis of the liver.
Therefore, different chefs will release different elements in the cooking process, and these elements have different effects on the body. Excess of any one of these elements will do harm to human body, so all kinds of kitchen utensils should be used alternately and complement each other.