Purple sweet potato color suppresses lipopolysaccharide - induced acute inflammatory response in mouse brain. (whfoods.com)
Five modules (red, pink, purple, midnight - blue and light - yellow) specific to the vacation effect (enriched by 2 - to 35-fold for the relaxation effect signature) were highly enriched for pathways related to stress and immune processes, such as acute inflammatory response, defense response and IgG binding (red module), hydrogen peroxide catabolic process (pink module) and response to stress and wound healing (purple module). (nature.com)
It is caused by a deregulation of the immune system triggering an acute inflammatory response. (sciencedaily.com)