Bone content in the bones is related to genetics, hormones, nutrition and exercise, among which genetic factors affect bone density up to 70-80%. If a mother has back pain and shrinkage in middle age, her children should pay special attention to the establishment of bone density and avoid accelerated loss. In addition, according to statistics, the following types of people have a higher chance of suffering from osteoporosis than the general population, so early prevention and regular bone density measurement should be done: 1, age: after 30 years of age, regardless of gender, because the absorption of bone mass is greater than the production, bone mass will gradually decrease. 2, nutrition: especially in adolescence, diet long-term lack of calcium. 3, activity: too little or even those who do not exercise. 4.Lack of estrogen: 6-10 years after menopause, bone mass will decrease rapidly. 5.Overly lean body: unable to effectively transform male hormones into female hormones due to the lack of fat cells. 6, smoking: the rate of bone loss in smokers is about 1.5-2 times that of normal people. 7, high amounts of alcohol or caffeine: resulting in calcium loss by urine. 8, high phosphorus diet: excessive sports drinks or most of the red meat, which contains a large amount of phosphate often combined with calcium in the digestive tract, and reduce the absorption of calcium in the digestive tract. 9, disease: suffering from kidney or liver disease, diabetes, hyperthyroidism, rheumatoid arthritis and a few endocrine diseases or ovarian, uterine, stomach or small intestine removal, more likely to cause secondary bone loss. 10, drugs: long-term use of steroids, antispasmodics, diuretics, anticoagulants, gastric drugs and painkillers, etc.