The weather is cold in winter, and some people are afraid of the cold and don’t want to go out. They just sit on their balcony and bask in the sun through the glass, thinking that this can supplement calcium. Can you really supplement calcium by sunbathing through glass?

　　Sunbathing is to supplement vitamin D.

　　Cao Xuexia, deputy director of the Department of Endocrinology, xuanwu hospital, Capital Medical University, said that the main purpose of sunbathing is not to supplement calcium, but to supplement vitamin D. The main function of vitamin D is to promote intestinal calcium absorption, increase muscle coordination and prevent falls. When in the sun, ultraviolet rays reach the skin, and 7- dehydrocholesterol in the skin will gradually transform vitamin D. However, if you bask in the sun through the glass, the glass will block some ultraviolet rays, and the amount of ultraviolet rays will be obviously attenuated, which will affect the absorption of vitamin D and calcium.

　　Experts suggest that ultraviolet rays should be exposed to the outside world under the condition of adequate protection, and ultraviolet rays will be attenuated through glass, especially B-segment ultraviolet rays that stimulate the skin, which will affect the transformation of vitamin D and thus the absorption of calcium. If you need calcium supplement, most of the calcium still needs to be taken from food, such as milk or calcium tablets.

　　It is advisable to bask in the sun for less than 30 minutes.

　　Sunbathing through the glass really can’t promote the absorption of calcium, and it may even get sunburned. If you really can’t go out for activities, you must also open the window and let the sun directly contact your skin. "Shorts and short sleeves in summer, showing face and hands in winter" is the best choice.

　　It should be noted that the time spent in the sun is not as long as possible, and too long exposure may hurt the skin. Most people can spend 10-20 minutes in the sun every day. Children can spend a shorter time and the elderly can spend a longer time, but it is generally recommended to spend 30 minutes. If necessary, you can wear sunglasses to avoid eye damage caused by direct sunlight, and wearing a hat can avoid hair sunburn. After sunbathing, it is necessary to replenish water in time and vitamin C selectively to inhibit the production of melanin and prevent sunburn.

What is happiness? The explanation in modern Chinese dictionaries is the circumstances and life that make people feel comfortable.

Happiness not only has its own feelings, but also reflects people’s cognition of the external living environment and their own development conditions. With the development of the times, people’s definition and evaluation of happiness are also changing quietly.

The Great Survey of Good Life in China (2020— 2021) found that although the epidemic had a great impact on people’s lives and production, in 2020, the overall happiness of China people did not decrease compared with the previous year, and 45.29% people thought that they were happy and were in the middle of the 15-year happiness curve of China people.

What affects people’s happiness? The big survey took 15 years to find the answer, and we found that the factors affecting China people’s happiness were changing in the past 15 years.

From the overall trend, the influence of income on happiness is diversified. Since 2015, the proportion of "income level" on happiness has been rising continuously, from 35.77% in 2015 to 65.74% in 2019, and dropped to 54.24% for the first time in 2020. It shows that people’s views on the relationship between income and happiness will turn in 2020, and income is no longer as important to happiness as before.

"Social security" is the security of people’s livelihood, which is related to the well-being of everyone and every family. With the continuous improvement of the social security system, people’s sense of gain is also increasing. The influence of "social security" on happiness is not as significant as it was ten years ago.

Family relationship and health status have always been the two core factors supporting people’s happy life, and their influence on happiness has fluctuated little in recent years. How important a harmonious family relationship and a healthy body are to people’s happiness.

Who cares more about health? The survey found that people with an annual income of more than 300,000 pay the lowest attention to health status, while people with an annual income of 50,000-100,000 and less than 50,000 pay a higher attention to health status, and people with an annual income of 200,000-300,000 pay more attention to health status. Without health, sometimes everything goes to zero, and low-income people are more worried about a series of troubles and life pressures caused by physical health problems.

From the perspective of families with different incomes, middle-income families and low-income families also pay more attention to health status than high-income families.

In the eyes of most people, young people of generation Z often pay more attention to themselves and are not very close to their families. However, a large survey found that their inner feelings may not be well expressed. From different ages, young people born after 1995 have the highest choice, and they are more willing to seek the understanding of their families and have a good and harmonious family relationship.

On the scale of happiness, a large survey found that family relationship is the most important weight. There are 22 provinces, autonomous regions and municipalities in China, and the proportion of family relationships affecting happiness has reached more than 40%, and the proportion of other provinces, autonomous regions and municipalities has reached more than 35%.

The top three places are Tianjin (51.62%), Shandong (47.65%) and Jilin (47.23%). Family ties have a deep-rooted influence on China’s happy culture.