The Women’s Health Initiative has shaped women’s health for over 30 years, but its future is uncertain

Women make up more than 50% of the population, yet before the 1990s they were largely excluded from health and medical research studies.

To try to help correct this imbalance, in 1991 the National Institutes of Health launched a massive, long-term study called the Women’s Health Initiative, which is still running today. It is the largest, longest and most comprehensive study on women’s health ever conducted in the U.S. It also is one of the most productive studies in history, with…