Five daily foods that are harmful to your health

　　Popcorn

　　Popcorn used to be my favorite, especially when watching movies. A bucket of popcorn and a cup of Coke was very satisfying. But later I learned that popcorn is good for me. nerve The system was damaged, so I had to quit. Because the lead content in popcorn is as high as about 10 mg/500 g, long-term use is likely to cause heavy metal poisoning. Lead poisoning mainly inhibits enzymes containing sulfhydryl groups in cells, causing biochemical and physiological dysfunction of the human body, causing spasm of small arteries and damaging capillary endothelial cells. Energy metabolism causes porphyrin metabolism disorders, hinders the synthesis of methemoglobin, changes the normal performance of red blood cells and their membranes, inhibits the resynthesis of creatine phosphate in muscles, etc., resulting in a series of pathological changes, among which changes in the nervous system, kidneys, hematopoietic system and blood vessels are more significant.

　　MSG

　　MSG is no stranger to us. It is a very important flavoring agent whose main ingredient is sodium glutamate. It can increase the umami flavor of food and is most commonly used in Chinese cuisine. It can also be used in soups and sauces. It should be noted that if MSG is used at high temperatures above 100°C, the flavoring agent sodium glutamate will be converted into sodium pyroglutamate, which is carcinogenic to the human body. Since the oil temperature during stir-frying is generally between 150°C and 200°C, MSG will turn into toxic coked sodium glutamate. Therefore, steaming or boiling is the best method for cooking "semi-finished" side dishes with MSG added. Also, if it is in an alkaline environment, MSG will react chemically to produce a substance called disodium glutamate. The daily intake of MSG per person should not exceed 6 grams. Excessive intake will increase the glutamic acid content in the blood, restrict the body's use of calcium and magnesium, and can cause short-term symptoms such as headaches, palpitation, nausea, and also have adverse effects on the human reproductive system.

　　Stinky Tofu

　　Stinky tofu is a fermented tofu product spread throughout China and other parts of the world, but it is a very popular snack in various places. However, studies have shown that soy products will produce amines such as methylamine, putrescine, tryptamine and hydrogen sulfide during the fermentation process. They have a special odor and are highly volatile. They are also putrefactive substances that decompose proteins and are harmful to the human body. In addition, if amines are stored for a long time, they may interact with nitrite to form nitrosamines, which are strong carcinogens.

　　pickles

　　Pickles are a kind of fermented food that uses high-concentration salt liquid and lactic acid bacteria fermentation to preserve vegetables, and enhances the flavor of vegetables through pickling. Pickle , pickled mustard all belong to the pickled vegetable series. Eating a lot of pickles can easily cause vitamin C deficiency and stones in the human body. In addition, pickled foods contain the carcinogen "nitrosamine" which is harmful to the body and causes stomach cancer direct cause. Pickles generally contain too much salt. High concentrations of salt can also seriously damage the gastrointestinal mucosa, which is harmful to the gastrointestinal tract and can lead to high blood pressure, overburdening the kidneys, leading to nasopharyngeal cancer, and prone to ulcers and inflammation. Therefore, people who often eat pickled foods have a higher incidence of gastrointestinal inflammation and ulcers.

　　Fried dough sticks

　　Fried dough sticks are high-temperature fried foods. The oil temperature reaches 190°C, and the oil is used repeatedly, which will cause the oil to age, become darker in color, increase in viscosity, and increase in odor. Various nutrients contained in the oil, such as essential fatty acids, various vitamins and other components, are basically or completely destroyed by oxidation. Unsaturated fats Fatty acids polymerize to form macromolecular compounds such as dimers and polymers. Various polymers produced after repeated high-temperature heating of unsaturated fatty acids, especially dimers, are very toxic. These polymers can affect the normal development of animals, reduce fertility, cause abnormal liver function and enlarge the liver. For example, eating fried dough sticks every day can poison the brain and nerve cells, and even cause Alzheimer's disease.