1) The document discusses how gender influences health and the environment in the context of migration, HIV/AIDS, and food security in South Africa. 2) It presents results from a household survey of 500 households in Johannesburg that show female-headed households are larger and women are more likely to feel at risk of HIV than men. 3) The study finds a need to consider women's multiple roles and vulnerabilities to design more effective health interventions for migrants, given trends toward more female migration and the burden of sickness.