Looking for information about yams for twins?

According to a 2008 analysis of births in southwest Nigeria, which has the highest twinning rate in the world, there is a possible link between yam consumption and an increased chance of having twins among the Yoruba population in that area. It is believed that yams contain a natural hormone called phytoestrogen, which may stimulate multiple ovulation. Therefore, some people suggest that eating yams for twins may be beneficial, although more research is needed to fully understand the relationship between yam consumption and twin births.