If we are to achieve true gender equality, we need to tackle everything that contributes to the discrimination and marginalization of women -- including menstruation.
While menstruation is the most natural thing in the world, it often keeps girls out of school and the workplace, with devastating consequences that can last generations.
Menstruation is, was or will be a reality for half of the world's population. Yet, it remains a taboo subject with an enormous impact on the life chances of women and girls everywhere.
Women and girls menstruate every month for approximately 35 years -- a total number of days that adds up to around seven years.
For many, that means seven years of anxiety and discomfort because of social stigma. Physical problems are also a major issue -- and a barrier to some women achieving their true potential.
In many countries, girls are kept at home for one week every month because they lack the means to look after themselves during their menstruation.
This puts a brake on their educational achievement, with severe knock-on effects on their ability to contribute to their families and communities and to society as a whole. When menstrual hygiene is properly managed, it contributes to social and economic empowerment and growth, across the board.
First, it helps girls to go to school and opens up all kinds of opportunities from sporting activities to work placements. Second, it contributes to achieving gender equality by enabling girls and women to participate in social, educational and economic activities at the same level as boys and men. Third, managing menstrual hygiene means investing in water infrastructure, which reduces all kinds of health risks.
In developed countries, we take access to affordable menstrual products, accurate information on our menstrual cycles and clean water for granted.
But elsewhere, the absence of these basic necessities means many girls drop out of school during adolescence. This puts them at higher risk of poverty, exploitation and early pregnancy, with all the health risks that involves.
These practical probl