**6. Conclusion**

To maintain its multiple functions, bone is renewed periodically, assuring resorption of old bones and formation of new matrix. However, naturally with age, the process of bone renewing is altered with higher bone resorption and decreased matrix *Study on the Impact of Diseases and Medical Treatments on Bone Mineral Density DOI: http://dx.doi.org/10.5772/intechopen.110318*

deposition, which lead to decreased BMD and increased fracture occurrence. Several diseases and treatments contribute to or engender osteoporosis or other bone problems. Those diseases and treatments generally affect hormones or bone mineral levels. The most important hormones for a normal bone remodeling process are: (i) estrogen, (ii) testosterone, and (iii) cortisol. And the most important mineral disturbed is calcium. When the absorption of calcium by the bones is inhibited, bones deteriorate easily and undergo fractures. In order to limit the side effects of treatments and additional bad impacts of diseases, using anabolic and antiresorptive treatment is mandatory accompanied by good dietary habits.
