Don't let sunscreen blocking vitamin D

Shanghai no. 6 people's hospital, osteoporosis and bone disease of doctor of vice director of specialized subject WangChun

Sources: health

        A few days ago, Shanghai no. 6 people's hospital, according to a survey, "city" universal existence vitamin D deficiency or lack of. Experts special remind "city", vitamin D deficiency and lifestyle changes, prevent ultraviolet supplies and other relevant, and meaningful sunlight is to satisfy the need of vitamin D the most important, the most convenient means.

        Vitamin D is a kind of the human body needs important and special fat-soluble vitamins, is to maintain bone health important vitamins. Lack of vitamin D will interfere with calcium absorption, can lead to osteoporosis.

        Vitamin D deficiency is a global problem

        In recent years, more and more study found that vitamin D deficiency and insufficiency has become an increasingly serious global problem. Countries are prompt study a lot of different genetic background of the crowd in a vitamin D deficiency and lack of state. The latest data show that more than 90% of the colored and 75% of white exist vitamin D deficiency. According to the report, Thailand and Malaysia postmenopausal women lack of vitamin D in the incidence rate of about 50%, but Japan and South Korea is as high as 90%.

        At present there is no Chinese people lack vitamin D status of large sample research. To Shanghai, Beijing and Hong Kong area part of the crowd, the study found a lack of vitamin D is also a very serious problem, in all ages are very common, but also has obvious relationship with the season.

        We Shanghai "healthy adults and hydroxyl vitamin D3 level and bone mineral density and the relationship between" the study found that, in Shanghai citizens both men and women, no matter the age height, vitamin D deficiency and disadvantages are widespread. We have 452 healthy adults by serum 25 hydroxyl vitamin D3 inspection, found that 88.9% of men and 90.7% of women for vitamin D deficiency or lack of. By this token, the human body vitamin D deficiency situation at least in the city is not optimistic.

        Vitamin D deficiency and a variety of diseases

        Vitamin D is a precursor of the hormone, is to guarantee the growth and maintenance of skeletal muscle system of the normal functioning of the important material. Human get vitamin D is the main source of sunlight and food intake. Our skin is a kind of 7-dehydrocholesterol cholesterol, it passes through the ultraviolet illuminate of UVB into vitamin D3. Produce skin vitamin D3 through the blood delivery to the liver, where into 25 hydroxyl vitamin D3, and then further transport to the kidney and mononuclear macrophage system, finish by 25 hydroxyl vitamin D3 into 1, 25 (OH) 2 vitamin D3 process, thus become a biological activity of vitamin D. 1, 25 (OH) 2 vitamin D3 as a kind of hormone re-enter cycle, regulate the small intestine, kidney and bone calcium absorption and metabolism, to promote bone growth and reconstruction. In addition, in the immune system in 1, 25 (OH) 2 vitamin D3 also play an important role of cytokines, to protect the body against microbial invasion.

        The most important function of vitamin D is to keep the balance of bone calcium, it can enhance small intestine's absorption of calcium, and by adjusting the parathyroid hormone to maintain blood calcium and blood phosphorus concentration so as to maintain the normal bone mass. Because of vitamin D and calcium phosphorus metabolism is closely related to the lack of vitamin D in childhood may lead to rickets, but in adults can not only cause osteomalacia, still with bone mineral density, osteoporosis and even reduce the fracture. And vitamin D deficiency still with malignant tumor, cardiovascular disease, multiple sclerosis, infectious disease, metabolic disease (such as type 1 diabetes) and autoimmune diseases (such as rheumatoid arthritis) about. Vitamin D is also influence the expression of many genes, regulating cell proliferation, transformation and apoptosis.

        Three ways can complement vitamin D

        Vitamin D deficiency for many reasons, including climate conditions, season (in winter season illumination time is less), latitude (high latitudes), air pollution, dressing habits, diet habit (inadequate intake of dairy products), etc. In the modern city vitamin D deficiency but also because the change of lifestyle, such as outdoor activities reduction, often use uv protection products, bring about the skin to accept ultraviolet irradiation reduced; Weight gain and obesity, make vitamin D in the body easily fat tissue accumulation storage and not easy to be the direct access to use, also can cause serum vitamin D levels drop.

        So, how to use the method can meet the need of the human body for vitamin D? The most important and the most simple method is to create a meaningful sunlight. In other words, every week 2 ~ 3 times, each time 5 ~ 10 minutes, will arms and legs, or hands, arms and face exposure in the sun direct illuminate.

        In addition, some food contains relatively rich vitamin D, such as dairy products, salmon, dry mushrooms and duck egg yellow, etc., can be appropriately increased such food intake. In addition, appropriate vitamin D preparation to guarantee the body vitamin D levels is also very effective means. Adult recommended daily amount of vitamin D in preparation for every 200 units; The elderly due to lack of sunshine, and intake and malabsorption, often have vitamin D deficiency, the recommended dose for daily 400 ~ 800 units, such as active vitamin D piece, one tablet daily.