October 20 is the world Osteoporosis Day, with the theme of "early screening of bone mass and early prevention of fracture". Turning to the prevention of osteoporosis, Wang Weiguo, director of orthopaedic joint surgery of China Japan Friendship Hospital, stressed that calcium supplementation is very important, but calcium supplementation alone is not enough to prevent osteoporosis. Clinically, osteoporosis can be divided into three types: senile osteoporosis, postmenopausal osteoporosis in women, and osteoporosis caused by special diseases. In recent years, osteoporosis patients have shown a younger trend. Experts believe that this has a lot to do with contemporary people's living habits. "The root cause of osteoporosis is calcium deficiency, and the absorption and utilization of calcium requires active vitamin D. human skin can synthesize vitamin D, but active vitamin D can be formed only after sunlight and liver metabolism. However, many young people like to stay indoors and lack sunlight," Wang Weiguo explained, "Another reason is that bone development needs appropriate mechanical stimulation. Some young people do not move for a long time, resulting in bone loss and disuse osteoporosis." How to correctly prevent osteoporosis? Wang Weiguo said that we should first achieve a balanced diet. "Calcium supplementation is very important to prevent osteoporosis, but the body not only needs calcium, but also vitamins, carbohydrates and cellulose. Due to an unbalanced diet, vegetarians may be prone to calcium deficiency. It should be noted that there is no scientific basis for the claim of calcium supplementation by eating big bones and collagen." Even if you take enough calcium, you can't absorb and use it well. Experts suggest taking part in more outdoor activities, appropriately increasing the light time and promoting the body's synthesis of active vitamin D. "if you don't take enough calcium or make full use of it, you can use some 'calcium + vitamin D' composite supplements," Wang Weiguo said. Experts also suggest that after menstruation, women go to the hospital endocrinology department or gynecology department to check the changes of hormones in the body, and be alert to osteoporosis or menopausal symptoms. The majority of elderly groups should do regular physical examination, find bone abnormalities early and do targeted treatment early. "If osteoporosis has occurred, it is necessary to prevent falls from causing fractures. Common osteoporotic fractures include spine fractures, hip fractures and wrist fractures. Once a fracture occurs, its complications will cause great harm to the patient's health." Wang Weiguo reminded. (news agency)