Credit: Maria Corte You have full access to this article via your institution. As a postdoctoral researcher, Jennifer Rabin spent her days studying how risk factors for heart disease corresponded to the chance of developing Alzheimer’s disease. In 2019, shortly after she started her own laboratory at the University of Toronto, Canada, she met with a PhD student who wanted to study women’s health. Together, they began to explore whether an obvious sex difference, the drop in the hormone oestradiol during the menopause transition, might be connected to higher rates of Alzheimer’s in women. Rabin was astounded by the research literature — or rather, its scarcity. “I just couldn’t believe how little we know,” she says. The student’s project was a turning point for Rabin. Over the next few years, she realized that across many conditions, women’s health was uncharted scientific territory. Rabin thought that profound insights could emerge from dissecting large data sets for health differences between sexes.…