In theory, no matter what you eat, there is no way to replenish bone density. This is because decreased bone density is commonly seen in medicine as osteoporosis. Osteoporosis is theorized to be a condition in which there is no way for the bones to grow back once they are loose and the normal bone trabeculae within the bone are missing. Only through the current calcium supplements, promote calcium absorption and take special drugs, can prevent continue to lose bone density, because it is a gradual process, gradually lead to a decrease in bone density, rather than all of a sudden lead to a decrease in bone density. In cases where osteoporosis is detected, oral calcium and vitamin D supplements, oral medications for osteoporosis, etc. should be taken.