The increasing focus on Women's Rights in the United States during the 1980s focused attention on the fact that many drugs being prescribed for women had never actually been tested in women of child-bearing potential, and that there was a relative paucity of basic research into women's health. In response to this the National Institutes of Health (NIH) created the Office of Research on Women's Health (ORWH) in 1990 to address these inequities. In 1993 the National Institutes of Health Revitalisation Act officially reversed US policy by requiring NIH funded phase III clinical trials to include women. This resulted in an increase in women recruited into research studies. The next phase was the specific funding of large scale epidemiology studies and clinical trials focussing on women's health such as the Women's Health Initiative (1991), the largest disease prevention study conducted in the US. Its role was to study the major causes of death, disability and frailty in older women. Despite this apparent progress, women remain underepresented. In 2006 women accounted for less than 25% of clinical trials published in 2004, A follow up study by the same authors five years later found little evidence of improvement. Another study found between 10–47% of women in heart disease clinical trials, despite the prevalence of heart disease in women. Lung cancer is the leading cause of cancer death amongst women, but while the number of women enrolled in lung cancer studies is increasing, they are still far less likely to be enrolled than men.
In addition to diet, exercise and other lifestyle factors can also play an important role in bone health. Smoking and drinking too much alcohol can increase your chances of developing osteoporosis, while weight-bearing exercise (such as walking, dancing, yoga, or lifting weights) can lower your risk. Strength or resistance training—using machines, free weights, elastic bands, or your own body weight—can be especially effective in helping to prevent loss of bone mass as you age.