Bipolar disorder (BD) is causally associated with inflammatory bowel disease (IBD), according to a study published online Sept. 20 in Frontiers in Genetics. Zhe Wang, from the First Affiliated Hospital, China Medical University in Shenyang, and colleagues performed bidirectional two-sample Mendelian randomization (MR) and selected single nucleotide polymorphisms (SNPs) associated with BD and IBD. SNPs...