There are many ways including getting older, not intaking enough calcium and not intaking enough vitamin D.
by not having enough calcium in the body.(calcium helps bind bones together>
Age related changes Reduced physical activity Genetic factors Hormonal influences and the body's calcium nutritional state
Well, calcium deficiency is a big factor because calcium help builds up bone strength. One of the biggest causes tho, is lack of exercise because after not using your muscles and bones as much as you...
That is the correct spelling of osteoporosis, a weakening of the bones.