Osteoporosis is a disease in which the bones become more porous.  They lose their original density and strength.  Its usual victims are women postmenopause.  Here are a few common risk factors for developing osteoporosis.

1.  Being Underweight – Your body always adapts for what it needs to do.  If you don’t weigh very much, then your body only needs to have strong enough bones to carry around a light body.  This means bones will deteriorate.  Also, if you’re chronically underweight, then you may not be getting enough calories to provide the nutrients needed to create bone mass.

2.  No Weight-Bearing Exercise – This is essentially the same concept as #1.  The body only adapts to whatever type of activity you put it through.  If you never make your bones carry extra weight, then the bones will not be given a stimulus to become more dense.  One way to do this through your own bodyweight is simply to stand on one leg or do single-legged exercise.  Usually your legs are sharing your body weight, but if you only use one then you are giving it extra stress to make it denser.

Some good exercises would be things like:

– Walking

– Jogging/Running

– Squats

– Leg Press

3.  Calcium Deficiency – I think everyone knows about this.  It’s just a matter of actually doing it.  Eat your dairy products or get in some green, leafy vegetables.  Vegetables with Calcium

4.  Vitamin D Deficiency – Get some sunlight!  At least, you should get fifteen minutes’ worth a day. How Much Sun Exposure Do I Need for Vitamin D?

For further in-depth study: Mayo Clinic’s Write-Up on Osteoporosis