As the name says, porous bones that are compressible like a sponge. Bone density becomes poor. This disorder weakens bones and leads to multiple fractures.
As bone is composed of proteins, calcium, phosphorous and collagen, all of which give strength to the bones.
The causes of low bone density are many. Few are obesity, poor nutrition, diet low in calcium, hyper or hypothyroidism, sedentary lifestyle.
Tweaking diet for better absorption of nutrients and achieving ideal body weight is beneficial for strong bones.