Scientists and physicians with the US-based cancer research and treatment organization City of Hope are presenting new research on high-fiber dietary interventions for bone marrow and stem cell transplant patients at risk for graft-versus-host-disease (GVHD) and myeloma at this year’s ongoing American Society of Hematology conference (December 7–10) in San Diego, California, US. One featured study led by Jenny Paredes, Ph.D., City of Hope staff scientist, suggests that consuming a high-fiber diet after transplantation could reduce the risk of developing GVHD by supporting a healthy gut microbiome.