These 7 foods are scientifically proven to put you in a bad mood

There's a reason our stomachs are sometimes called our second brains. Our gut produces about ninety percent of our serotonin, the chemical responsible for making us feel good. So in an effort to stay our calm, upbeat selves, we chatted with Rachel Kelly, mental health advocate and author of The Happiness Diet(in stores and online September 26)to find out which foods might be putting us in a bad mood. (Et tu, fries?)