Background. Osteoporosis is one of the most importance diseases of contemporary civilization, diagnosed in over 25% of women and 10% of men over the age of 60. This article describes the negative impact of the growth of civilization on the development of osteoporosis. Recommendations are given for proper nutrition. The article also discusses the mechanisms governing the potential impact of physical exertion, one of the strongest stimuli of osteogenesis, on the prevention of osteoporosis. The authors suggest the possibility of preventing osteoporosis by daily exposure, 15-20 minutes long, ultraviolet light in patients with risk factors caused by the use of drugs (steroids). This article evaluates the therapeutic efficacy of a low-frequency alternating magnetic field (LFAMF) in the prevention of bone mass loss in patient’s long-term steroid treatment. Material and methods. Our research involved 25 men with chronic obturative pulmonary disease (COPD) receiving long-term steroid therapy. The patients were administered a program of LFAMF therapy, receiving 2-3 month-long treatment courses within a one-year period. Before and after LFAMF therapy the patients were evaluated for the degree of pain intensity and the number of COPD exacerbations, and their BMD and T-scores were compared densitometrically. Results. In all patients after two years of treatment we found less pain, a more than two-fold reduction number in the number COPD exacerbations, and increased bone mass.