1. Lead-containing food
Lead can significantly reduce the levels of norepinephrine, dopamine, and serotonin in the brain, causing nerve conduction blockage and leading to symptoms such as memory loss, dementia, and impaired intellectual development.
Excessive lead intake in the human body can also directly damage the function of deoxyribonucleic acid (DNA), the genetic material in nerve cells. Not only does it make a person more susceptible to dementia, but it can also cause a dull complexion and premature aging.
2. Pickled foods
When pickling foods such as fish, meat, and vegetables, the added salt can easily be converted into nitrites. Under the catalytic action of enzymes in the body, nitrites are prone to react with various substances in the body to form carcinogenic nitrosamines. Eating too much of these foods can easily lead to cancer and promote premature aging.
3. Moldy food
When grains, oils, peanuts, beans, meat, fish, etc., become moldy, they produce a large amount of bacteria and aflatoxin.
Once these moldy substances are consumed, mild symptoms can include diarrhea, vomiting, dizziness, blurred vision, irritability, enteritis, hearing loss, and general weakness. In severe cases, they can cause cancer and birth defects, and also promote premature aging.
4. Limescale
After long-term use, teapots or other water vessels can develop limescale. If not cleaned in time, drinking from them frequently can cause diseases in the digestive, nervous, urinary, blood-forming, and circulatory systems, leading to aging. This is because the limescale contains harmful metal elements such as cadmium, mercury, arsenic, and aluminum. Scientists once conducted a chemical analysis of the limescale from a thermos that had been used for 98 days and found a high content of harmful metal elements: 0.034 mg of cadmium, 0.44 mg of mercury, 0.21 mg of arsenic, and 0.012 mg of aluminum.
These harmful metal elements are extremely detrimental to human health.
5. Peroxides
These are peroxides of unsaturated fatty acids.
For example, cooking oil that has been used to fry fish, shrimp, or meat and then left for a long time will form peroxides. Also, long-dried fish in the sun, cured meats, long-stored biscuits, pastries, oil-tea meal, and oils, especially those that have become rancid, will produce peroxides after the oil has spoiled. Researchers have found that once peroxides enter the human body, they cause great damage to the body's acid systems and vitamins, and accelerate the aging process.
6. High-temperature cooking oil fumes
After comparative analysis, foreign research institutions have pointed out that Chinese people prefer to use high-temperature cooking oil for preparing dishes, with stove temperatures being about 50% higher than those in Western homes.
Typically, under high-temperature catalysis, cooking oil releases smoke containing butadiene components. Long-term and large inhalation of this substance not only alters the body's genetic immune function but also increases the risk of lung cancer.
Research reports indicate that rapeseed oil is more carcinogenic than peanut oil because, at high temperatures, it releases 22 times more butadiene components than peanut oil. To avoid this hazard, when cooking, it is best not to heat the oil above its boiling point; using hot oil is preferable. This can prevent the health-damaging effects of smoke and soot and the formation of wrinkles on the face.
7. Smoke
When harmful gases from stoves, soot, cigarettes, and dust are inhaled through the respiratory tract into the lungs and then seep into the bloodstream, they cause great harm to the body.
This is especially true for smokers. When they inhale smoke, nicotine, tar, and carbon monoxide create conditions for cholesterol deposition, which can lead to arteriosclerosis and promote aging.