Many people think that osteoporosis is simply a lack of calcium, but it is not. Medical research has confirmed that just taking calcium tablets and vitamin D is not effective in treating osteoporosis and preventing osteoporosis sub that fracture. Vitamin D is to promote calcium absorption, calcium is a material needed for bone formation. There are 2 kinds of cells in human bone, one is osteoblast and one is osteoclast. Under normal circumstances, bone metabolism is through the formation of new bone by osteoblasts, osteoclasts break down the old bone and absorb it, the formation and absorption of bone in a constant dynamic balance throughout a person’s life. In childhood and adolescence, bone formation is greater than bone resorption, bone mass increases, and bones are constantly strong, and at the age of 30-40, bone formation and bone resorption are in balance, and bone mass is maintained at a high level. After the age of 40 for women and 50 for men, bone formation is less than bone resorption and bone mass begins to decrease. At this time, if there are some risk factors or other diseases that lead to increased osteoclast activity and accelerated bone resorption, or decreased osteoblast activity and slowed bone formation and decreased bone mass, all these can lead to osteoporosis, and it is useless to simply supplement with more calcium. It is recommended that the elderly population have regular bone density checks.