Ota Boming (director of the Women's Medical Center of Shanwang Medical Center) really began to "see" and "be old" from about 30 years old. Once the human body faces the 30-year-old mark, "bone strength" will begin to decline. From hand and foot bones, waist bones, back bones to facial bones. Our bodies are completely supported by bones. If the strength of bones weakens, our bodies will have various problems. The most obvious symptom is the change of appearance. Women will have "facial aging" and men will have "middle-aged obesity" with protruding abdomen. (Editor's recommendation: the face is exposed to bone loss! The decrease of bone strength is mainly due to insufficient bone mass caused by bone loss. If there are symptoms such as poor posture, backache, difficulty getting up, difficulty climbing stairs and lifting feet, you should be careful that the bones have begun to lose. In addition, the decline of various functions of the body will gradually lead to many seemingly unrelated aging phenomena, such as arrhythmia, shortness of breath, hair loss, rough skin and easy fatigue. The wrinkles, drooping bags under the eyes, decree lines and other "facial aging" that most annoy women are actually the results of facial bone atrophy caused by bone loss. The bone mass of human skeleton reaches its peak around the age of 20, and then it will gradually decrease, especially after the age of 45, the rate of bone loss will accelerate rapidly. Therefore, people who used to think that they were "too young to worry about aging" should pay special attention now. Human bones are rebuilt and renewed every day. Our bone tissue includes osteoblasts, osteoclasts and osteoblasts. Osteoblasts are the main cells in mature bone tissues, and osteoclasts and osteoblasts are responsible for bone replacement. Through the metabolism of these cells (bone metabolism), old bones will be replaced by new bone tissues, maintaining a certain strength and softness, while protecting the health of the body. It takes about 5 months to renew healthy bones, and the whole skeleton renewal cycle is about 2 years before the age of 20, 3 years for adults and 5 years once they enter old age. Compared with the skin epidermis and other parts that can be completely updated in 28 days, the replacement of old and new bones can be said to be very slow. The speed of bone metabolism will be greatly influenced by living habits. Bad habits such as abnormal diet, insufficient exercise, excessive weight loss and smoking will make bone metabolism stagnate and bone loss, thus weakening the strength of bones. As far as we know in the past, bones have three functions: supporting the body, storing calcium, and hematopoietic bone marrow. Calcium is the main raw material for bone building, and it is also an indispensable nutrient (mineral) for maintaining various functions of the body such as heart and blood vessels. However, in recent years, we have found that bones actually hide the power to make the human body "young, strong and beautiful". The most important function of bone strength is to "create youth, toughness and beauty", the most representative of which is the ability to control blood sugar and visceral fat accumulation, thus inhibiting obesity. At the same time, the method of activating bone strength is also very simple, as long as gravity and impact force are applied to the bone. Through moderate exercise and applying gravity load to bones, we can awaken this power to create youth, toughness and beauty, and easily prevent obesity and facial aging. Even if you just go to a roller coaster and other facilities, the acceleration of gravity is enough to activate bone strength. This article is taken from One Day 100 Seconds, Away from Osteoporosis/Ota Boming (Director of Women's Medical Center of Shanwang Medical Center)/Time Publishing.