Calcium plays an important role in the physiological regulation of the human body and in the growth and development of bones. Insufficient calcium intake can affect nerve excitability and muscle contraction, and can even cause bone mineralization insufficiency, resulting in damage to the strength of bones, easy fracture and other adverse consequences. The main symptoms caused by calcium deficiency in the elderly include the following: first, the most common is osteoporosis and muscle spasms, which is commonly known as cramps, when the elderly lack of calcium, due to the decrease in serum calcium ion concentration, resulting in increased nerve excitability, so the nerve is easy to contract under minor stimulation, thus inducing muscle contraction and spasms. For example, the most common thing is that when the elderly are asleep, the calf gastrocnemius muscle, that is, the calf stomach cramps suddenly appear at night, often able to wake up, and often need to stand up the foot and lower limb straightening to relieve, if the frequent occurrence of cramps is a typical manifestation of calcium deficiency; second, osteoporosis, calcium intake is too low is one of the main reasons, due to low calcium intake, the mineralization of bone is incomplete, thus This leads to a series of symptoms such as osteoporosis, such as generalized bone pain caused by generalized decalcification, mainly in the hip, knee and spine. Because it is easy to fracture, minor injury will cause vertebral fracture, including vertebral hip, etc., seriously affect the life and life safety of the elderly; Third, short height is an insidious manifestation of osteoporosis, because each vertebral body has a small deformation and compression fracture, resulting in gradually short height, some people may be shorter than normal on 8-10 centimeters; Fourth, teeth easily fall out, is also a calcium deficiency Fourthly, teeth are easily lost, which is one of the hazards of calcium deficiency and affects the eating and digestive functions of the elderly. It is also easy to cause deformity of the spine, such as kyphosis and scoliosis, which are caused by osteoporosis.