Produce nitrite. The nutritional value of green leafy vegetables was destroyed overnight, and nitrite was also produced. As long as nitrite enters the stomach, it will form a strong carcinogen and induce the occurrence of gastric cancer.
People habitually put overnight dishes in the refrigerator, which will breed a lot of bacteria if they stay wet for a long time. When they continue to heat the next day, they can't completely kill the bacteria, which will lead to gastrointestinal diseases and even food poisoning in the long run.
Extended data:
Vitamin C contained in fresh vegetables is most easily destroyed in cooking. Eating vegetables raw is the best way to eat. People who eat a lot of raw vegetables have high levels of some important nutrients in their blood. Even if you only eat one serving of raw vegetables every day, the contents of vitamins A, E, B and folic acid in the human body will be closer to the recommended amount of nutrition.
Therefore, people invented vegetable salad. It is made of fresh vegetables, ham, bacon, cheese and salad dressing. These sauces can be used to make salad vegetables with different flavors. Vegetable salad is delicious and very popular with women and children, but there are hidden dangers behind it.
Although salad is known as "the best way to maintain nutrition" and a diet to lose weight, people have begun to pay attention to the calories contained in salad dressing. In fact, salad dressing is not low in calories and fat.
According to statistics, each serving (15g) of salad dressing contains about 100 kcal, which is twice as much as rice or white flour with the same weight. Used in cold salad is not less than cooking with oil. The content of fatty acids and cholesterol in salad dressing is also higher than that in general food, and excessive consumption will have adverse effects on the cardiovascular system of human body.
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