Data Of Womens Bmi Help W/ Research Paper Supporting Evidence For: Womens Influence In Household Purchases?

Help w/ research paper supporting evidence for: Womens influence in household purchases? - data of womens bmi

I am doing research on the hypothesis: women make most purchases or influence most of what you buy at home. And I'm struggling to find the backup data support for my thesis. Does anyone know where the statistics, online, etc, or help in books and magazines to find me?