Bone mass peaks for most people when they’re in their 20s. After that, it’s normal for bone density to decrease but factors combine to accelerate the loss of bone mass for some people. Women are more at risk, as are older people in general. People with smaller frames tend to suffer more from loss of bone mass since they had less bone to begin with.
Hormonal factors also contribute to the rate of bone loss. Both women and men experience greater bone loss as their primary sex hormone production falls. However, this effect is more pronounced in women after menopause with the decrease in estrogen. An overactive thyroid, parathyroid, and adrenal glands may also cause increased rates of bone loss.
Calcium intake is also crucial to the bone renewal rate. Chronically low amounts of dietary calcium may inhibit the development of new bone. Bariatric surgery for weight loss or other surgery of the gastrointestinal system may also affect how much calcium your body absorbs.