Disadvantages of sunbathing Disadvantages of not sunbathing for a long time

Sunbathing can promote the synthesis of vitamin D and prevent osteoporosis. In addition, many men and women think that wheat color is a healthy skin color, so many people are very keen on sunbathing. However, it is dangerous to expose the skin to the hot sun for a long time, you know?

Induce cardiovascular and cerebrovascular diseases

A survey of cardiovascular diseases in Beijing found that hot and muggy weather is a dangerous weather leading to ischemic stroke.

Patients with hypertension and cardiovascular diseases are exposed to high temperature, so the body heat is increasing, the myocardial oxygen consumption is also increasing, and the cardiovascular system is in a state of tension. Due to sultry heat, blood vessels will dilate and blood viscosity will increase, so it is prone to cerebral hemorrhage, cerebral infarction and myocardial infarction, which can lead to death in severe cases.

suffer sunstroke

When you are in the sun, your body temperature will rise, and your body will regulate your body temperature by sweating. However, if the lost water is not replenished in time, the amount of sweat discharged will be reduced, and the heat of the human body will not be distributed, which will easily seal the sweat and lead to heatstroke.

When people suffer from heatstroke, they will have dizziness, brain swelling, delirium, nausea, vomiting and other symptoms, which may even lead to coma and death.

Cause skin ultraviolet allergy

Ultraviolet allergy is an abnormal photorefractive reaction caused by sunlight. There are two kinds of penetrating ultraviolet rays in the sun, UVA and UVB, which will directly reach the dermis of the skin, making the skin exposed to the sun for a long time feel red, swollen and burning. Medically called solar dermatitis, it is also called ultraviolet allergy.

Melanin deposition

The human epidermis has a layer of basal cells, which contain "melanogen", which is a complex substance. Under the action of ultraviolet rays, "melanogen" will turn black and deposit on the skin surface, making the skin appear dark brown. This is a taboo for women who advocate "one white covers all the ugliness".

Melanin deposition is also the chief culprit of skin problems such as freckles and sunburn, so women who love beauty must pay attention to sun protection.

Increase the incidence of skin cancer

Occasionally exposure to the sun will lead to peeling and redness, but if exposed to the scorching sun for a long time, it will increase the risk of skin cancer.

Accelerate skin aging

Long-term exposure will destroy the skin structure, accelerate the aging and failure of skin cells, make the skin lose elasticity and wrinkle.

It makes people tired and sleepy

When the temperature rises, the skin pores relax, and the blood supply increases, while the oxygen supply to the brain decreases correspondingly, and the work of the brain slows down, it will be easy to get tired, and the limbs will be weak, which will naturally make you sleepy.

Tips

Exposure to the sun for a long time will really do great harm to the body, but avoiding the noon sun in winter and sunbathing occasionally can promote the absorption of calcium by the human body and make people feel warm!