Many people associate vitamin D with calcium, and even simply believe that supplementing calcium means supplementing vitamin D. Recently, Ms. Zhao (pseudonym), 46, from Zhejiang Province, discovered a lack of vitamin D during a physical examination, which puzzled her, who often eats eggs and drinks milk. She took the examination report to the hospital for further treatment. The topic # Zhejiang female white-collar workers often drink milk but found a lack of vitamin D # also made it to the hot search. In fact, calcium and vitamin D, as two essential nutrients for the human body, cannot be equated. According to the reporter's interview, if there is a lack of vitamin D, it is not ideal to drink milk and other dietary supplements. According to reports, Ms. Zhao is a 9-to-5 white-collar worker with a regular lifestyle, but recently she has been feeling back pain and pain, and the effect of applying plaster is not obvious. After reading the physical examination report, the doctor found that the content of 25-hydroxyvitamin D in her serum was only 16ng/mL, much lower than the normal value of 30ng/mL. "Lack of vitamin D, coupled with a decrease in estrogen levels before and after menopause, makes it more prone to symptoms such as low back pain and muscle weakness. In severe cases, osteoporosis and pathological fractures can also occur in daily life, The statement that "drinking more milk can prevent osteoporosis" is often heard, but this statement is not comprehensive. Regarding this, Dai Yongmei, the chief physician of the Nutrition Department of Nanjing Maternal and Child Health Hospital, introduced that there are many reasons for osteoporosis, and calcium deficiency and vitamin D deficiency may be inducing factors. Supplementing calcium and vitamin D separately is also a basic measure, but drinking only milk is more important for calcium supplementation. Vitamin D is generally scarce or almost non-existent in food, with only relatively abundant levels in marine fish. Vitamin D is mainly supplemented by drugs or exposed to sunlight. When human skin is exposed to sunlight, the ultraviolet rays in the sunlight and 7-dehydrocholesterol under the epidermis can synthesize vitamin D. The main function of vitamin D is to promote the absorption of calcium in the intestine into the bloodstream, thereby regulating bone growth and development, and maintaining bone health. Therefore, for Office workers should pay attention to increasing their exposure to sunlight to reduce the incidence of vitamin D deficiency However, it should be noted that the more vitamin D, the better. Dai Yongmei reminds that with sufficient calcium, the recommended daily intake of vitamin D varies among different age groups. The recommended intake for children, adolescents, and pregnant women is 10 micrograms per day, while for elderly people over 65 years old, the recommended intake is 15 micrograms per day. Generally speaking, defects in tooth development, bone pain, pathological fractures, and other conditions can all be symptoms of a lack of vitamin D. In severe cases, it can cause rickets, such as O-shaped or X-shaped legs. If in doubt, seek medical attention immediately and do not blindly supplement with medication without the guidance of a doctor. (Xinhua News Agency)