Tierney Brosius, assistant professor of biology, explains why the loss of bees means declining food security. ¡°I would say about 50% if not three-quarters of the products on the shelves in the grocery store would be negatively impacted by a drop in pollinators overall,¡± she told KWQC News. ¡°Unfortunately, it is a lot to do with us. It¡¯s a combination of habitat loss, nutritional issues.¡±