Reason:
There are many reasons for human illness, mainly two: environmental factors such as air and climate. Physical fitness, eating habits and other acquired factors.
Whether catching a cold is the result of the combined action of internal immunity and natural virus. If you are in good health, you can keep it with the virus and you won't get sick. If your health declines and your immunity weakens, the virus will take advantage of it and get sick. "It's like fighting a war. With insufficient strength and poor equipment, it is naturally difficult to resist foreign invasion. "
Young people are usually healthy and have relatively strong immunity. Under normal circumstances, they will not get sick easily, even if they catch a cold occasionally, they will recover easily. However, due to the obvious variation of cold virus, the antibodies produced by this cold often have no effect on the cold virus that people come into contact with next time-this is also the reason why people will catch colds repeatedly. If the cold virus does not mutate, it is very simple to treat a cold. As long as everyone is given an injection at birth, they will never catch a cold for life.
In addition, not being sick for a long time does not mean that immunity does not work. On the contrary, a seemingly minor cold will make your body weak in a short time. If you have symptoms of high fever, it will take longer to return to normal health before the onset. The common "minor illness" of a cold is not directly related to the "serious illness" that is difficult to cure. Whether you have a "serious illness" is mainly related to congenital genetic factors and acquired living habits, and has nothing to do with whether you have a cold.
Extended data
How to prevent colds:
(1), pay attention to food diversification.
In order to enhance the body's resistance, we must eat enough nutrients every day, such as cereal staple food, beans, eggs and milk, fish and fruits and vegetables, etc., to ensure a balanced nutrition, pay attention to the combination of fine and coarse grains, and coarse grains should account for at least 1/3 of the staple food.
(2) Eat more fruits and vegetables.
Vitamin C has the functions of resisting oxidation, enhancing body resistance and preventing colds. Foods rich in vitamin C are characterized by fresh fruits and vegetables.
(3) Eat seafood and nuts properly.
Many people don't usually eat much of these two foods, but they are both rich in zinc, which can directly inhibit the proliferation of viruses and enhance the immune function of body cells.
(4) Drink plenty of water
Drinking more hot water is not empty talk. Drinking more water can accelerate metabolism, increase urine output, promote toxin discharge, and keep the oral cavity and nasal mucosa moist, thus preventing the invasion of influenza virus to some extent.
(5), proper exercise
Exercise can also enhance resistance, but it is best to choose slow aerobic exercise to avoid accidents such as muscle strain. And pay attention to wipe sweat and change clothes in time after exercise to avoid catching a cold.
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